Concentrate on processer and memory. P4 doesnt use video card acceleration and I doubt P5 will either. so if you're not playing games, spending 300+ on a video card is probably a waste when you can use that money on more ram. poser is a ram hog and I'm sure as was stated before the latest DDR sdram will probably be of benifit. make sure you get it in 512 cards rather then 256, my brother just baught the latest system from sony with 512 but when he opened the case found that there were 2 256 filling the two slots so no way to expand without jetisining brand new ram but thats what you get from a major manufacturer. go with a custom job, preferably from a local shop if you don't like digging around in your own case, you may pay a few more bucks but if something goes wrong it's a short ride to get it fixed My personal choice for a processer is an AMD xp2100 at about the same performance as the latest P4 chip it's way cheeper.