After much consideration, I've decided against a
completely new build. The 3.2 P4 I have still has alot
of life left in it. So...that being said...anybody know
anything about good socket 478 PCI-express
motherboards? I did a quicko search and saw where
Albatron (px915p4, px915g4) and Asus (p4gd1,
p4gpl-x) have mobos for this application. Has
anybody tried these motherboards? Are they even
available? Are there better ones out there?

I was planning on updating the graphics card anyway
- looking at a Radeon x850 xt - but there seems to
be a big price difference between an AGP version and
a PCI-e version ($389 vs $255). It would make sense
to drop a few extra bucks and upgrade the mobo
too. That way I can still use my current CPU and
memory - which are working fine for me. Plus, and
correct me if I'm wrong, I should see better transfer
rates on the PCI-e versus my AGP 8X that I have now
- 8x vs 16x. Twice as fast is always good!! If
anybody has any input, I would appreciate it.

Save your money until you're ready to do it right, otherwise you'll be locking yourself into old technology just for the sake of PCI-E

But....if you plan on using Windows Vista, it does't support AGP.

I wonder what'll happen if I do this ?

Who mention Windows Vista? And if you haven't heard, Microsoft is delaying it's release until 2007...apparently there are security concerns that have to be hammered out.

"But....if you plan on using Windows Vista, it does't support AGP"

Where did you come up with that? Vista will fully support AGP.

read here - http://www.microsoft.com/technet/windowsvista/evaluate/hardware/vistahardware.mspx#ENB

What old technologies are we locking ourselves into if we re-use existing RAM, HD, and CPU that we would have replaced anyway? What am I missing?