IF you are building a machine FOR Poser. You really don't need a hi end PC. The memory management of XP and > 512MB or ram will be useful. Standard AGP video cards work just fine for Poser 4 (Who knows about 5) as others have said it wasn't written to take advantage of OpenGL or other 3D hardware acceleration. BUT I can say that I can't live without my dual monitors and a Matrox G450 32MB Dualhead card. Poser is fantastic spread out over two monitors. One screen just for your working window and the other screen for your tools. Even though Poser wasn't written to take advantage of Dual Processors, the OS WAS. I find that my dual processor machines are more robust and you seldom see the hourglass. Plus I can burn CDs when I am designing in Poser. I put mine together for about the same money as a dual processor system. < 1000 dollars. You can use dual Celerons if you use slockets and dual slot 1 motherboards. tomshardware.com has done benchmarks between dual PIII and dual Celerons and the L2 Cache deficiency of the Celeron is negated in a dual configuration.