The fact that I own so many medium format cameras is proof of my inability to decide which one wins!
Right now I'm particularly interested in rangefinders. These three have been staying on my desk whenever I'm not using them, just so I can enjoy looking at them.
I also am very attracted to all four of my Bronica SLRs and even the Mamiya 645 Pro TL. But without a doubt the SLR that feels the best in my hand is the Pentax 645N.