Second install went without a glitch with 5751 as Ethernet and the end screen says perfect install.
Once I reboot for the first time, panic screen show up with errors on the Ethernet.
Again, once rebooted, the machine works like a charm. Some tweak here and there with the network setting got the machine work as it should.
Thanks for the great thread, very informational indeed.
Never mind the option button during install.
Here's my build and it works great, only thing missing is my Ethernet card in which I'll sort out later.
AC97 Sound Card
Boardcom - not working (AppleBCM5751Ethernet may work, will update)