I would like to use my old PC as a router (using pfsense) so I'm looking to find a small chassis to accomodate a DTX motherboard (9.6 × 8 inches | 203 × 244 mm) a 2.5'' drive and the PSU (which will be another headache to find a small one).
Unfortunately the iStarUSA Rackmount/Wallmount and Standalone cases don't fit a DTX motherboard.