You should know that a Core Duo will not address more than 2GB RAM. The early Core 2 boards will see 3.4 or so, the later ones can actually handle 6GB apparently (Not just the latest ones either).
If I am not mistaken the board I choose will handle 8GB of RAM . Internal PSU is what id like but if it is a small External one I wouldn't mind that. I need lots of room inside if i want to make room for 2 full size serial hard drives which I may leave it as one drive instead.
I would Rather use a mac board so I dont have to deal with patching and Ill still have a mac chime. Assuming Ill loose the chime when I switch over to a standard intel board.