shapel

Hello,
As a 2 decades of MS-Windows user I have switched to Mac OS X a month ago. And my knowledge is not enough to fix my problem which encountered yesterday and my brand new MBPro is dead now.
I installed Win-7 x64 on Boot Camp. My mistake at first is I have allocated very little space to Windows from my precious SSD disk. Yesterday I have tried to increase the Boot Camp partition from 80GB to 250GB. What exactly i did is;
1- Started in Windows 7, taken a full Windows system backup into an external USB Disk.
2- Switched to OS X and created a disk image (dmg) from my existing Boot Camp partition (Using Std. OS X's Disk Utility) this was my second backup. Since I don't want to get in trouble with activation of all my MS Office, Windows 7, Games etc. I was planning to restore one of those to my New Windows with larger disk capacity.
3- in OS X, I have erased the Boot Camp partition (disk0s4) and enlarged the master HFS+ partition (disk0s2) to maximum physical disk capacity using Disk Utility so I had single HFS partition with ~750GB
4- Started Boot Camp and performed a clean copy of Windows x64 and this time I have given a disk size of 250GB for the new Boot Camp partition (simply; 250GB to Boot Camp, 500GB to OS X)
5- Standard installatin went well. Windows asked for product key, i skipped this and started up new Windows for the first time, saw that it is running well. I shut it down and restart in OS X.
6- Now the first of the series of the problems that eventually ended up with the death of my MBPro is coming up, Disk Utility refused to restore from DMG file (ref.step 2 - image was created from previous Windows partition so it is NTFS!) to new pysical Boot Camp partition (also NTFS). It said something like both disks were not identical or something like that. I checked the block sizes etc. Both was 512kb. I googled and found an alternative way to restore and skipped Disk Utility and switched to terminal window. Executed DD if=dmg of=disk04s to copy content of backup DMG file to new Boot Camp partition. Needles to say, Windows didn't start up, a black screen appeared and the worst thing is when I started in OS X, Disk Utility was showing only 80GB for the Boot Camp partition (which has to be 250). The capacity was overwritten by the previous partition's image file and all of a sudden I happen to lost 250-80=170GB.
7- I decided to go with the other option to install a clean windows and use Windows7@s Backup/restore. To be able to do this I needed to start over and delete the Boot Camp partition again and resized the (single partition) master HFS volume to its Max (of 750) as I already did in step 3-4.
8- Started Boot Camp, this time Boot Camp gave me an error saying 'Can't install Boot Camp to multiple partitioned disk'. I already knew that Boot Camp requires a single OS X (HFS) partitioned disk so he can manage the partition table withing his screens. I was amazed with this error cause I knew that I already removed the last Boot Camp partition and resized the main HFS partition to its maximum.
9- The golden shot, I have restarted my OS X. And it never came back. Thanks God, my repair partition was still healthy so I booted with command+r in repair mode. Now I have terminal windows open.
I have run `diskutil list` and I couldn't believe the thing I saw, Boot Camp (or Disk Utility not sure) has changed the type of my primary OS X partition to MS-DOS (Fat 32) I guess, it says 'Microsoft Basic Data'.
I've been desperately looking for a way to change the corrupted type of my existing primary HFS+ partition (I know all my data is healthy and waiting for me if I could manage to reach them)
Here's the outputs of;
diskutil list
/dev/disk0
:  TYPE NAME SIZE    IDENTIFIER
0:   GUID_partition_scheme *751.3 GB   disk0
1: EFI 209.7 MB   disk0s1
2:    Microsoft Basic Data 750.4 GB   disk0s2
3: Apple_Boot Recovery HD 650.0 MB   disk0s3
/dev/disk1
:    TYPE NAME SIZE    IDENTIFIER
0: Apple_partition_scheme *1.3 GB disk1
1: Apple_partition_map 30.7 KB disk1s1
2:   Apple_HFS Mac OS X Base System 1.3 GB disk1s2
/dev/disk2
:    TYPE NAME SIZE    IDENTIFIER
0: untitled    *524.3 KB   disk2
(*I cleared the rest as they're irrelevant with various mount points of repair disk)
and result of df
Filesystem 512-blocks  
Used Available Capacity iused ifree %iused  Mounted on
/dev/disk1s2 2464464 2223200 216624 92%  280978 27078   91%   /
devfs 399 399 0   100% 691 0  100%   /dev
/dev/disk2   1024 288    736 29%   34 92   27%   /Volumes
/dev/disk3   1024 280    744 28%   33 93   26%   /private/var/tmp
/dev/disk4   1024 312    712 31%   37 89   29%   /private/var/run
/dev/disk5   1024 280    744 28%   33 93   26%   /System/Installation
/dev/disk6   1024 528    496 52%   64 62   51%   /private/var/db
/dev/disk7 12288 3304   8984 27% 411  1123   27%   /private/var/folders
/dev/disk8   4096 832   3264 21% 102   408   20% /private/var/root/Library
/dev/disk9   2048 288   1760 15%   34   220   13%   /Library/ColorSync/Profiles/Displays
/dev/disk10 1024 336    688 33%   40 86   32%   /Library/Preferences
/dev/disk11 1024 312    712 31%   37 89   29%   /Library/Preferences/SystemConfiguration
/dev/disk12 2048 280   1768 14%   33   221   13%   /Library/Keychains
/dev/disk13s1   15600632  283400  15317232 2%    0 0  100%   /Volumes/GPARTED

Btw, I have the OS X Mountain Lion with latest updates (10.8.x).
Until now, I have tried GPARTED (made a bootable thumb-drive, it didn't run, it has frozen in keyboard selection screen), I have tried TestDisk, it didn't run either, simply returned an error code, made a search about gpt, fdisk etc. but couldn't find any information that's worth to try.
So I'm here and waiting for an answer from you guys, can you suggest me any direction to go, a tool to use to fix my existing partition with the wrong file system type?
Kind Regards
Sahin