Originally posted by Mionics
bro make sure that you get a power supply from a trusty source. xoxide.com is pretty good. make sure you go with the ones that are 500 watts and up and check the voltages. of course your memory should be dual channel. ocz is a good brand to go with. make sure that you get the lowest latency timing as well. also presonally i like geil as a brand too
Sorry to pick your post apart:
Newegg seems to be a very trusty source. Most people here get their parts from them without problems.
When you check PSUs, the voltages are the same for any new PSU. There is no need to check into the voltages. If anything, check the current (amperage) rating on each voltage supply (rail). The Antec I recommended will be fine.
Memory itself isnt dual channel. Its the motherboard that supports dual channel, or doesnt. OCZ RAM is good but wont perform any better unless you a) get the right kind b) overclock it. Lower latency RAM doesnt perform noticeably better than regular latency RAM.