Having been quite fed up after a few trips abroad with my Mamiya RB, 2-3 lenses, 3 backs etc., I recently bought a Fuji GW670III. I was a bit worried at first, I only ever used SLR's and thought the focusing would be difficult, now I could not be happier. The lens is absolutely stunning, as is the rangefinder (huuuge and contrasty), and the focus ring is the best I have ever felt in terms of tactility.
If you are looking for a fixed lens medium format RF you can't go wrong with the GWIII series. However, I do like shooting close portraits from time to time, I wouldn't wan't to miss the SLR for that. If that's something you do I would probably keep the Bronica along with the longer lens(es).