CCDs generally have bigger pixels for the same area - that's an advantage for the obvious light gathering potential but it also makes processing much quicker. Mono images are also likely easier to process.
For the same money you tend to lose a lot of area though. Why don't you just get a mono'd D5100 with a cold finger cooler? So you lose a little on fill (which is normally compensated by the micro-lens array) and you definitely lose on QE, but that's still a big, high-quality sensor right there.
-Cam
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