Nice score, Artur. As far as the Canon vs Nikon debate, they both are excellent brands, and are just as capable of taking the same quality photos. In fact, a master photographer can perhaps utilize some of the settings on the Nikon to take a better pic.
I myself shoot Canon. But that's only because I was able to buy a Rebel XT with kit lens, all manuals, cd's, etc. with the original box and receipt, in excellent condition, for $325 shipped. And I won't be changing, since I have since sunk about another $800 into glass. I have so far:
Canon 18-55mm f3.5-5.6 kit lens (came with camera)
Canon 70-210 f4 zoom lens
Canon 28-135mm f3.5-5.6 USM IS
Sigma 17-70mm f2.8-4.5
Canon 50mm f1.8 prime lens
It's addicting once you get into buying lenses, so be careful! Money goes quick lol.