For medium format, I use a Yashica D twin lens reflex and a Koni Omega Rapid 6x7 rangefinder. I shoot mainly one thing with 120 - landscapes. Preferred film of choice is Velvia 50. Though Provia 100F is very nice too.
The image below was shot with the Koni Omega Rapid. Film stock was Velvia 100 (I would have preferred the 50 but the original version was discontinued around this time.)
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I submitted a 20 x 30 inch print of this image to an exhibition and it won Second Prize in it's category, and also sold. A pleasant surprise - I certainly didn't see that one coming.