Digital BW, The Print

Dear Friends,

I am considering moving up from 35mm into medium format. Specifically,
I am thinking about getting a Mamiya's 645E camera and an Epson 3200
scanner to print bw on my existing epson 1280 using quadtones.  

Does anyone have experience with such a setup? Should I expect
significant print quality improvements? Right now I use the HP S20xi
scanner on my 35mm negatives.

Thanks,
Manuel