Beware PCI-Express mobos with only one x16 slot for a video card. A
quick search of several large mobo retailers just now turned up exactly
zero mobos with more than 1 x16 slot. There may be some available now,
but I don't know who or where.

If you get a PCI-X mobo with only one x16 slot, you won't be able to add
multiple x16 videocards onto it later, for dual+ videocard action. That in
itself is the main reason I'll be making a PCI-X system sometime next year,
after there are better, more mature PCI-X mobos- the ability to link up mul-
tiple video cards in multiple x16 slots, for a wicked boost in gaming capa-
bility. But if you don't ever plan on doing that, then go for it :-)
   -Marshall