I love my mamiya 645 pro tl. I was lucky and got the 80mm f/1.9 lens, which has never let me down. I *do* get what you are saying about switching ARs; it took me a while to get used to 645 after shooting on the rollei. Which surprised me, considering I shoot plenty of 35mm on various SLRs.
Anyhow, happy shopping - I don't think you will be disappointed.
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