T4i to 6D

The 85mm prime is definitely a good idea. I've just always heard that the 24-105 is such a great walkabout lens. I'm wary not to get TOO deep into photography. When I last had a DSLR, I got a bit addicted to the lens fetish and all. Distracted me a bit from my real work.

So I want something that's darn good, that will be great for a hobbyist who sometimes needs top quality for field research (but not Pro level), and that will work fine with no more than 2 or 3 lenses (there is the budget to think about too). I travel a fair amount and just cannot carry too much. By the way, does anyone EVER check their camera gear in air travel? I've already got lots of other stuff to carry on.