Depends on how much you want to spend versus the minimum performance you want. Celerons are good processors and are slightly "faster" than equivalent Pentium processors (II and III) because of the onboard L1 cache. If you have the cash burning a hole in your pocket, go with a Pentium III (choose a motherboard based on Intel's i840 chipset though and not the i810 or i820) or an Athlon. Actually, a 450Mhz Pentium II, 256Mb of SDRAM will run Poser like a champ and leave you money for an Oxygen 3D video card (the Oxygen 3D video cards cannot be beat for rendering 3D graphics and is the card of choice for CAD professionals). For an operating system, insist on Windows 2000 Professional. Poser will run faster and better on a dual-processor motherboard, even though it's not written to take advantage of a dual-proc system. Poser 4 runs almost twice as fast on my Tyan S1837 (two P-II 350Mhz processors) than it does on my Asus with a P-II/450Mhz proc. Actually, the operating system (Win 200 Professional) will split part of the load between multiple processors, as will the RISC processor on any of the Ozygen 3D cards. Caution: the Oxygen 3D cards are poor cards for games. You'll need something like a GEForce for games. R. Baldwin, MSCE Computer Wizardry Alexandria, VA