Too much info...

I'm sure either direction will be fine but i'm struggling over which platform to move to.  I've got a D90 with the kit lens that i'm going to pass down to my son and leaning toward getting a full frame.  The size and price of D600 or 6d appeals to me but could always go with a used body.  But i'm at a point where I want to get some good lenses so i'm not tied to any manufacturer.  Camera will be used for the broad range of family pictures, travel, but also a lot of kids sports, both indoors (basketball) and outdoor football and baseball.  I may rent the 70-200 2.8 lens for catching some of the indoor sports initially and get a couple good primes to start.

Video isn't a primary concern as I use my Canon HF G10 for sports video.

Can anyone who has experience with both Canon/Nikon (maybe others) give me the high points of any differences between overall platforms for my needs?

Thanks.