I do not have any experience with the Mamiya. When the bug first bit me, I first looked for a Rolleicord Vb as you are. Slow to find one at a good price, I ended up getting a Minolta Autocord in VG condition instead, for around $125. While waiting for it to come, a Vb came on eBay with a lower Buy It Now price and I got it for $175. Comparing the two, I don't really see any difference in the quality of the negatives. They both look great. The Minolta's Rokkor lenses were a real surprise that way. Handling the two, I much prefer the Minolta. It is easier to set the speed and easier to focus. I would suggest you add one of these to your list. Good luck.