Nikon, Canon, Leica, Mamiya, Pentax....... whatever!
Go to the largest camera store near you and ask if they rent gear. Rent it, both, or all and take it, both or them out and shoot the stuff! In these forums, a thousand people will give you their opinions about everything under the sun.... and in the end, only one matters. It's your eyes... let them decide.
Then go buy a D200... (HUGE FREAKIN' SMIRK!!! Sorry just couldn't resist!)