I would rather spend the time shooting pics than behind the PC.
For better or worse, you'll be spending a fair amount of time at a computer in post processing no matter which DSLR you choose. You'll want to shoot RAW for best results.
The good news is that you will have a great deal of control over the final image - much more than you do currently scanning Velvia.
Also - don't forget that the Nikon DLSRs all have a 1.5x crop factor so your 35mm wideangle would have the equivalent field of view of a 53mm lens. If you love wide angles, you might have to buy some wider lenses.