> I intend to design and build myself a decent home studio at my new place ... I'm not in a rush <
If you can wait about a month and a half, Wes Lachot and I are nearly done writing an article for the September issue of EQ magazine. It details the design of a purpose built one-room studio with proper ratios, angled walls, and so forth. Surround capability is also built into the design in case that's important to you.