A Rolleicord, perhaps. Or an early model Mamiya TLR (with one or two digits in the model name, not three)...although I have noticed that people have recently been asking stupid prices for them compared to what they were going for a year ago. Also, you might be able to get a basic 645 kit with that budget (Pentax, Mamiya M645, Bronica), and could fairly certainly get one for $50 more on top of your current budget. For example: I sold an M645 1000S with 80mm lens, metered prism, and 120 insert to an APUG member for $160 plus shipping. It was in bargain condition and needed $40 worth of light seal replacement (which he ended up doing himself), but worked great.