I have a suggestion, use brand name ram, like muskin, crucial, or
kingston. on newegg you can get 256mb of pc3200 muskin for $43. you can get 512mb of pc3200 muskin for around $78-$80
oh and I reccomend sticking with one(or two) brand for memory, Hard drives, and motherboards. if you use brand name ram, you can state that you use only quality parts(same goes with motherboards, use a name that is well know). by stating that people will be more inclined to buy from you. also, that will help you differentiate yourself from venders like dell and others, who don't always use the best parts(sometimes they use the cheapest, which can be bad) oh, and for the PSU, pick a brand like Thermaltake, enlight, enermax, antec(there may be a few other good ones that i missed that aren't too expensive) and stick with it. if you stick with one or two brands it will be easier to troubleshoot.(you are offering a warrenty, correct?)