I am a reasonably low-tech gamer (MMORPG) that really does need to upgrade my old computer (Athlon 2800+, AGP, IDE). I have a Antec 900 case, DVD, Sound card (Live!), and an Antec 450W PSU, but I need to upgrade my MOBO, CPU (prefer AMD), video card and move to SATA 2 Disk. I would like to stay...