Hey, I already have good specs on it from Atari-history.org. (http://www.atari-history.com/computers/pccomputers/pc-1.html) which show that it was the best 8088 computer around. The guy who's selling it says that it somes with Atari labeled MS/DOS, and Atari labeled GEM Operating system, which sounds good to me. Yeah, I think just talked myself into it. He is selling it for a good price.
Well, thanks anyway F.R.! But if you have already found anything interesting, let me know anyway!