if you do more portraits, get the canon. landscape wise i prefer to use the nikon.
or u might wanna look at more pics reference online and see which tones u prefer.
curves from a canon and nikon is different cause of the ccd and how they process those colours. i was at an apple concept store not in singapore scrolling through few hundred pics from iphoto, i can almost tell almost all canon pics from nikon,sony,etc.
some guys will tell you that you can simulate the same curves, but is it worth the extra effort.
just kidding, i personally think that long-term wise, not much of a difference. today 5D beats D700 with more megapixels, tomorrow Nikon gonna come up with something that beats Canon, next week Olympus comes up with something else.. the list goes on... So just go with your heart, buy and keep shooting!
I am currently using an Alpha 100 with the 2 kit lens for about a year. Long time ago have been in film using Yashica and later Nikon F601 (still keeping it). I mainly use it for travel and family. Hobbyist only... not so serious yet.
Actually, I prefer the D700 but the 5Dm2 have the added advantage of movie function. Will there be a newer D700 with movie function? Thank you.