A bit late to the party, not sure what the original poster ended up doing, but...
First, a very long time ago I rented a Bronica SQ-A and Hassy 503 for a weekend and took them out with the same film shooting the same subjects. The Bronica was 1/3rd of the price, and neither I nor the people at the lab could tell the difference on the slides, even under a loupe (Fuji Velvia 50 as I recall). They were identical (this was using the newer PS series lenses and Zeiss on the Hassy). I didn't feel the price difference was worth it to get the two little notches on the side of each frame, and went with the Bronica. Traveled around the world with that setup and was very happy with it, took many stunning images.
Much later, after being in a bit of a creative rut, I discovered the Rollei system, tried out a 6008 with some Schneider lenses and saw a noticeable difference in quality compared to the Bronica. Ended up selling the Bronica (it had served me well) and almost 20 years later I'm still using the 6008 with a whole compliment of Schneider lenses, and one rebuilt battery pack. It's heavier than the Bronica or Hassy, but with the handgrip is ergonomic and easy to shoot despite the weight. It's nowhere near as heavy or bulky as the Mamiyas. It's been a reliable workhorse since I bought it, and I wouldn't hesitate to recommend it to anyone considering medium format analogue photography. At least check one out and compare it to the alternatives, especially with the Schneider lenses.
The last few years I've been mainly focused on large format photography, but still love to go out with the 6008 as my handheld "explore a site" camera. I have a Rolleiflex TLR as well that serves nicely as a compact lightweight travel camera, but sometimes you really want interchangable lenses.
Hope this helps.