Depends if you need the 3 lenses I guess. If you're OK with a fixed lens, there is the GF670, they can be had for about $1200 used, or $1699 new. If you want to go a lot cheaper, there is Rolleiflex. I think TLRs are an acquired taste, but if you like them, they're great value I think, and the lens is great on a Rollei.

You could compromise on 6x4.5, then you've got Mamiya 645 or Pentax gear, all pretty cheap, and can be handheld like a big 35mm SLR. Might be a good in-between option, you get more shots per roll, but still get a big jump up on the resolution vs. 35mm.