Sorry I was unclear.
I meant at 1/30 - 1/60 shutter speeds with standard and wide angle lenses. I'd be happy to hit 1/60 almost all the time and 1/30 sometimes. I figured that this is generally attainable with any decent 35mm SLR but I've heard different things with 645 SLR's. I'm interested in something "acceptable" because I'm sure that a sturdy tripod + mirror lockup + cable release/timer is unbeatable.
I know that TLR's and rangefinders are better at these speeds, in general, but I don't plan on shooting at these speeds all the time; I'm trying to assess how versatile these cameras can be for me.