AnandTech: December 2004 HTPC Case Roundup. Big thing holding me back from building a home theater PC (htpc) has been a case. Now the Silverstone CS-SST-LC10B-M seems perfect at "$248":http://www.newegg.com/app/ViewProductDesc.asp?description=11-163-034&depa=0 from Newegg.
It is just $140 if you don't have the IR remote for the Media Edition software. So this is good for a full sized computer that needs to look like stereo equipment. You'll also want to change the fans out as it is a very noisy 56dB.
The nMediaPC HTPC-100 at "$140":http://www.newegg.com/app/searchProductResult.asp?Submit=Go&Range=1&InnerManu=8550&DEPA=0&bop=and&description=nmediapc&InnerCata=7 at Newegg. is another option if you can find a good microATX board (see the next post for a Dothan microATX). You have to change the fan out as it is only 60mm or use the Dothan Pentium M so it creates less heat.