Just keep an eagle eye on the 5DII because once the 6D hits the street production will very likely end for the 5DII. It's a real bummer when instant rebates come out and there's zero inventory. The FF bodies are slightly larger but it's pretty nominal when you set them SxS. FF IQ is definately better but crop cameras offer a feature set that's hard to ignore.
60D 5.7 x 4.4 x 2.8 1.71#
5D MKII 6.0 x 4.6 x 3.0 2.1#
Picking a used body will get you a better one for the same price.
At Potn forums i can see a Clean looking Canon 50d for 450$+ Tamron 17-50mm f/2.8 for 320$
for 770$ you get a killer set
I agree with Dave. on the size as i have not noticed any difference when upgrading to 5D from 40D.
But it depends on what kind of pictures you will take.
For studio, landscape and other wide pictures the FF will be best.
But for sports, wildlife, etc Crop will be better
The 5DMKII has been discontinued. Any one hoping to score a deal on a new one may want to check inventory now.
Who you jivin' with that Cosmik Debris?