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Hi Cam
The reason that Canon have been prominent in Astro work is two fold.
1) Nikons for a long time had an overly agressive noise reduction that would detect stars as noise and eat them out of images. Not sure if this is still the case but it was for a long time.
2) Canon has made the only 2 dedicated astro DSLRs out the (the old 20Da and the new 60Da)
The 60Da can be had for $1600-$1700 so if your budget stretches that far it is worth a look. I gather it is still usable for daylight use, but I would defer to others that have tried to offer an opinion.
The size of the sensor is not the major factor in pricing DSLR camera. For example the 5d MkIII is 22.3mp and costs arond $4k while the 1Dx is 18Mp and costs up to $7500.
I have a book on DSLR imaging with lots of useful info I can lend you if you wish!
Malcolm
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