After 10 days plus of trial and errors, I have now brick solid stable Core 2 Duo @ 3.72Ghz, Asus P5E Deluxe, Asus 9600GT working. For those who still have that trouble with BLUE SCREEN at login/startup, here's what I did:
I used all the kexts from this website , rebuild the kexts I need with mkexttool, using 9800 GT efi strings in com.apple.boot.plist, install 10.6.1 update but before I restart, I changed the screen resolution to my need, put pc to sleep > wake it up again > change the refresh rate > put computer to sleep > wake up again > restart computer and voila no more blue screen disappear. i had no external hdd connected.
I cannot guarantee if this will succeed for you or not. I did fresh installation about 5 times just to get it working...
Note that some kext only works for various version. If you have older kext version it will cause kernel panic issues.
10.6.2 gave me kernel panic due to video card.
Chameleon Boot RC3
DSDT patched with some fixes