@Dredloch
Installing MB, Processor and RAM in a new case is REALLY easy, as long as you do your homework. Its also cheap, and you get exactly what you are looking for.
I'm not a electronics whiz at all, but I just built my first computer a couple of weeks ago. The process was really simple, and the only hang-up I had was little things like connecting front-side USB. Now I have a really rocking system, all black and top of the line!
So, if you're already going to add the cards and peripherals, do the whole thing, just take your time and research exactly what you are going to have to do.
Check out some of the "Build your own PC articles" on the web like this one at Tom's Hardware:
http://www6.tomshardware.com/howto/20020904/index.html
BTW, how do I make this URL a hyperlink so that you can just click on it, and how do I make it so that you just click on blue text like "this one at Tom's Hardware" and you'd get sent there.
See told you I wasn't a whiz!
"If this is what you want to do, you'll do it, no matter how long it takes..........and usually the longer it takes the more fun you've had!"