I like the small InWin "BP" cases, like the one I used for Gypsy. My only real complaint about it, easily fixed, is that its power LED could be used to perform laser eye surgery. I was in and out of that case many times while dealing with an initial no-boot issue (mobo's fault; mSATA hold-down screw shorting to the case, fixed with a piece of electrical tape) and it continued to fit together perfectly. I'd buy another.
Furthermore, the included PSU was reviewed by c.hegge at HardwareInsights (actually at my request!) and while not 80+, it's otherwise mostly decent, although it does have some Samxon caps in it. For a HTPC, that should be a non-issue.