To me it comes down to three things:
1) Money
2) Money
3) Money
Okay, I'm being facetious, BUT... I can afford a DSLR and I can get results from it that I'm proud of (certainly will be once I'm computer controlled and auto-guiding).
You get a very large field from a DSLR and I find this pleasing but it also makes it dead easy to use - I don't have to spend ages lining up my field "just so". I can crop later. Field drifted a bit? No problem, crop it away.
For me, the marginal gain in going mono CCD probably isn't worth the cost. I'd sooner just get another scope and a mono'd DSLR.
The downside - long exposures in hot weather suck with a DSLR. Ce la vie, I should move back to NZ.
