let's just say there is no best of the best brand that all the pros use... end of the day it's up to personal preference, but all i can say is it seems like Canon and Nikon are the top 2 choices (at least for me)
This query has been asked more often than any other question and no one can answer this better than yourself. You'd need to be comfortable with the user interface (U.I.) as well as the whole system's accessroies.
Remember the old adage, you're not just buying a camera, it's a whole system to consider. READ MORE first... then go down to the shops and try them out. Dun get brain-washed along the way though, the salesmen will try to push whatever they have on hand or which they think will give them the best profits.