This isn't an a shameless plug or anything, I have no affiliation with these guys other than yes, I did buy a cheapie server from them and it works great! I use it for game servers like L4D & 2142 & all the old classics (red faction, quake series, etc.) The main thing to watch for in my opinion is the Hard Drive you plan on using with it. These are IDE only & the $99 one only accepts 1/4" single-platter drives or maybe a laptop drive. but it's perfect for me
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"How many teamsters does it take to screw in a light bulb?" "FIFTEEN!! YOU GOT A PROBLEM WITH THAT?"