For some reason I haven't paid much attention to this evergreen thread. I need to work my way through it. Forgive me if I'm repeating what others have said before.
I have several SRTs, and at least one needs John T's attention. But I wanted to put in a word for the very last of the line, the SRT SC-II, sold through Sears stores. I figure these "store models" (including the MCs, sold through K-Mart and JC Penney in the US, and the first versions of the SC and MC) are of rather second class status in the SRT line.
However, it has one feature that's not remarked on, as far as I can tell, and not available in the 100 and 200 models -- the stop-down plunger works regardless of whether the shutter is charged or not. In this way, it's reminiscent of other cameras like Nikons and Canons, and I think it's a lot more convenient. It doesn't stay locked down the way the earlier SRTs do, but I'll take it. Also, I like the fact it has a proper coin slot to unscrew the batter compartment. The other cameras' textured battery door can be more convenient, but if your thumb is sweaty, or the door is stubborn, it's a pain.
I got my SC-II from my brother in law some years ago -- he's the opposite of a packrat. His mother (my mother in law) worked at Sears, so I'm sure the family discount was put to good use. The case is very tatty -- a far cry from the really good genuine leather cases the 100s and 200s have, but at least it's intact. The plastic advance lever tip had disappeared long ago. Still usable without it, but looks offensive to me. I had actually bought a replacement tip years ago, and installed that last night. More serious is that somehow the lens in front of the eyepiece must have sustained a blow -- it's cracked across the middle. (Maybe John Titterington can replace it?) But actually I can look past it and focus pretty easily -- the focus screen has the microprism and split screen. The camera works fine in all respects otherwise -- but the proof will be in the results on film!