shutterflower, selling your bronica and getting a leica will make you miss the large negs. I just thought about the visible difference in the scans you've posted. There's a clear difference even on the slides scanned and shown on a sloppy computer screen. The difference for the colour neg is very large.
Of course it might be that you will enjoy shooting w the leica much more, which is of the highest importance, since both systems produce technically satisfying stuff (i bet).
Bottom line: i am truly sorry that you have to break/sell the bronica+multi pro combo.
If i had the $3500, i'd take it over as is and get rid of all my [pathetic] 35mm stuff. Seriously.
So this is also kinda answer to the main question. The last gear i would buy would be a modern MF system, preferably rangefinder a la bronica, mamiya 6 or 7. AND a MF film scanner.
Yes i know i'm not a cheap dreamer.