Athlon. Cheaper, faster, better.
1 gig will do ya, but there's a huge difference between 1 and 2 gigs. Other than the blazingly obvious more RAM that you can do more stuff with.
128 meg video card is more than enough for Poser's little appetite. 256 will get you into better gaming, not better Posering.
SLI won't help you with Poser I don't think.
AGP, unless of course you're looking beyond Poser (gaming again)
If you're looking for power, then obviously you will want to go with the Athlon and 2 gigs RAM. 2x256 meg videocards on a PCI Express. SLI all the way with that (hence the 2). Then you'll be able to run EverQuest II in almost all it's glory.

Message edited on: 03/31/2005 20:59