What price range you looking at bud?
http://www.cliosport.net/forum/showthread.php?588094-Nikon-5100
I upgraded to a D5100 last week mate. Still not had chance to go for a play really but I'm very impressed so far, especially in low light. Only thing I don't like is the fact that it doesn't have an in-built autofocus motor, but I would have had to spend another ~£250 for the D7000 (which has a similar tech spec).
Best advice is to go and try both the D5100 and the Canon equivalent, only you will know which interface you prefer.