I shoot with both... 5DII and 7D. But I need primarily to take sports/action shots. Other times I need the max detail and other features of the FF camera.
For what you shoot, the 5DII might be a better choice.
OP, try to keep the 85/1.8. You'll miss it if you sell it! I'd hate just having a 50mm with FF (I like 50mm a lot on crop, but not so much on FF... just a personal bias).
Canon store online had refurbed 5DII for $1999 recently, if it helps.
What do I know, though... Hey, I think 24-70 is excellent on crop and use it all the time. IMO, it works pretty well on FF too, though.
There is no actual difference in depth of field.... What's different is that with the same lens you will tend to stand closer to your subject with FF, with the result being that effective DOF changes (appears shallower when you are closer). So, real world shooting DOF seems like it's shallower with FF.
Other considerations... FF can do even lower light shooting. A much lower density sensor means its high ISO is cleaner (approx. one stop's worth). And 5DII will still focus... though slowly... about 1 EV lower light... after 7D has given up entirely.
At smaller apertures, diffraction starts to set in sooner with crop camera... f8 or a little larger with a dense sensor like the 7Ds. With FF you won't see it start until f11 or f16. Plus, loss of fine detail due to diffraction is more dramatic or amplified on the cropper as your apertures get smaller, than it is with the lower density sensor of the FF camera.