I just did some basic research and built mine from no prior building knowledge. It really didnt take me that long either. I also have a screwless case, so I didn't need a screwdriver which probably saved me some time. It really isnt hard, for me it was like a 4/10. Just make sure you have the regular windows98 CD, and an windows Upgrade XP CD when installing windows. I built mine last month on the 20th btw.
edit: 200 bucks? wooow, that is the biggest f'n bs i've ever seen LOL. just do some research online, use the search engine on tech-forums, and you'll probably find some good stuff. Plus, its always cool to know you build the computer yourself