I have an NVidia 8800GTX and it has been very stable. I've never had a crash in the hair room, although I've never made any presentable hair there :biggrin:

Besides Poser Pro, Poser 7 will also take advantage of a quad core processor.

IMHO There's really no point in getting a 64 bit processor unless the motherboard can take more than 4GB of memory, and if it can - given the current price of memory - you should get as much as possible now. Technology changes so quickly that there is no guarantee that a few months from now you'll be able to find DDR2 memory for the motherboard. And if you do, it might be rare and expensive.