You said open to other cameras, which I assume is the motivation for several offers of TLRs when you talked about SLRs. May I suggest the Mamiya RB67? It's 6x7 rather than 6x6, but you can easily acquire a full kit for under $200 and you can find a 6x6 back if you really prefer that format. Also 6x4.5, 6x8(-ish), 70mm backs can be had. There's a lot of good lenses, cheap, and the viewfinder is HUGE. Of course, it's big all around, which might be a hindrance if you're planning street photography or other handheld work. I have two and I love them.