Replying to What camera do you use to shoot 120 film?

Just wondering what camera's people here use to shoot medium format?
There's quite some options out there to shoot 120 film and it seems to be quite popular on here. Let me tell you I'm more of a digital guy (still), but would really like to start shooting film more.
I shoot with a TLR at the moment, but find it hard to frame because of the double lenses. I'm thinking of getting a little more into it and investing in a slightly more convenient system.

Pentacon Six, Hasselblad (or the Kiev 88 clone), Pentax 67, Mamiya 645, TLR or a some foldable camera. what do you shoot?
Also, what do you find advantages/disadvantages of your system or other systems?

Quite a stupid question maybe, but are there any medium format camera's that have a build-in light-meter?