jackc-
For 6x6 I like the Rollei cameras (Rolleicord / Rolleiflex), for 6x45 I just love Mamiya 645's.
These can be had for 200 or less in good condition, depending on model and lens.
With the Rollei's lenses are fixed, Mamiya is interchangable.
They are twin lens reflex / single lens reflex cameras, thus the image on you matte screen will be flipped.This might be new (and a bit awkward) to you, yet it will help to slow you down, haha.SLR type medium format cameras are heavy. The Rollei's are lighter.
The other route are rangefinder-style cameras - even lighter / more portable, but sometimes poor focusing, often poor (plastic) construction, downright ugly cameras (you notice I'm not a huge fan), of yourse excellent pictures can be taken with these, don't think you'll get one of these for 200-ish though.
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salad
Figure out first a) your budget and b) the aspect ration you want to shoot - would be my suggestion, and let's go from there!