Silverstone LC11 micro-atx htpc case
 

The case I want to look at today is slightly larger than most of the current HTPC chassis designs, but the advantage to this is that it allows you to use the more commonly and cheaply available micro-ATX motherboard form factor. It also packs a slightly more powerful power supply and has room for plenty of ventilation, something that becomes essential when you want to stack it beneath or on top of other hot components like VCRs or satellite decoders.

http://www.3dvelocity.com/reviews/sslc11/lc11.htm