FO3 Platform conversion

Sup /games/,
I read from time to time but I figure I'll post here for the first time since i want a serious answer.

I have the 360 version of Fallout 3, but I want to exchange it for the PC version so i can start modding for it, but my computer isn't up to speed, and since i kinda want to get more into the PC gaming world, I think I should get a whole new gaming rig.

Where should i be looking for a new comp? Microcenter? some place online? Are there any vidya related features i should be looking for? what is a reasonable price? is this a /g/ question?

>>6
650$ for just the three components I listed? that sounds expensive, my prices also include 19% vat. but my experience with american prices is kinda outdated (dollar was still at parity with euro back then) try looking at newegg.com or something
I counted 650€ for everything inside the case except hard drive

here's the rest:
am3 ddr2 motherboard 60-70€ (i always get one with sound and lan built in)
case+psu 100€ (you can save some on the case but always get a good psu if you should buy these seperately, although it's usually a better deal to buy a (example) antec case which includes 500W antec psu)
750GB hard drive 60-70€, maybe 1TB is a better deal, you should calculate yourself how much it costs per GB, also, I heard bad things about Samsung HD's... almost as bad as IBM's click-of-death series