Building rig with old components - Need help!

Hi, I'm pretty smart when it comes to software and stuff, but I'm not much of a smartass when it comes to hardware.. I'll just go straight out.

I bought the GT5082 about 2 years ago, when I had no idea of hardware, and had no knowledge that pre-build PCs suck. Now, I still use it.. but since a year ago, I regretted it. So now, my "Foxconn C51GU01", which came with the GT5082's PCI-E slot broke.. I'm pretty pissed, because now I have to run this crappy 6100. I hate bad graphics cards. I'd rather use a 8500GT.

So anyways, I'm tired.. so long story short, I want to rebuild a PC.. I want to still use my processor, hard drive, ram, etc., but I want to change my motherboard and case.. I still want to keep my OS, etc. I know that one bad move, and I can lose expensive parts. So can anyone give me a detailed tutorial, on how to rebuild a PC with a new Mobo and case?

(Oh and also, the reason I dont just get a new mobo/case and just make it easier is because the "Foxconn C51GU01" is BTX, and I want an ATX. BTX motherboards are what, 300 dollars normal?)

Thanks. :]



For the specs of the hard drive, memory, etc, here you go.


Overall parts

GT5082 Memory Info

Hard Drive Info

Custom bolding from me so it's easier to see.

Overall parts
http://www.skyline-eng.com/index.cfm/fusea...ategory_ID/5179.

Memory Info
http://www.memorystock.com/memory/GatewayGT5082.html

Hard Drive Info
http://www.dealtime.com/xPF-Gateway-Gatewa...5082-Desktop-PC

So obviously, I have a MICRO-BTX... So I'll need a new case. So I think these parts might work! All I need to know what to do now is that I need to find out how to take out these components..

Thanks guys.
Can you tell me if it's compatible, just to make sure?[u][/u]

AND ALSO, Can you tell me a good ATX 939 motherboard? Thanks. Please take note that I have a VERY TINY budget. I don't even raise my own money :x