advise for the thread starter:
please think in terms of the following:
1. cost
2. liquidity: if one day u haev to sell your stuff for some reason - how easy is it to sell it? which will translate to what you will have to buy in the first place. generally, canon and nikon stuff are easier to sell because more people use them
3. convenience: how many of your friends use the same system? if all of them use nikon, why not join them? easier to borrow gear
4. your own handling preference: for me, i prefer EOS interface and the nice white L telephoto lenses. for you, your taste may be different. pls go and try out all kinds of gear before settling for a system