the tx-2 performs better then the mx-2 though.. somehow.. haha. i never understood what made a thermal paste better then any other.. but whatever..
and yeah, go with a corsair psu some are modual. also if you want to buy your rig now and then wait a bit for some upgrades, what you could do is get an EVGA card now like a 9800GTX and step up when the new cards come out. Along with that, buy a cheap-o e2140/2160/2180/2200 and just oc the crap out of it to get good speeds, then buy a new cpu when they come out. Also you can get any of those chips to around 3ghz without a problem.