As somebody who owns a 7D (since it came out in 2009) and a 6D (for 6 months), I can say that I like having the two bodies. The 6D has taken over all of my photography except for sports, bif, and aviation/airshow in-flight shots. I am planning on upgrading the 7D to the Mark II as sports are a big part of what I do.
In your situation, I would probably get the 6D first, unless your interests lean much more strongly to sports, bif, or focal-length constrained distance shooting.
Note that occasionally the 6D comes up on a refurb deal from Canon for under $1300. That is how I got mine, and it was perfect; completely indistinguishable from new, and Canon backs them with the same full warranty a new camera comes with.
I was worried about FF lenses, and still haven't completely solved that issue. I have the excellent Rokinon 14 2.8 which I bought on a deal, and I have the wonderful pre-art Sigma 50 1.4 EX (this lens is underrated -- it has great sharpness and the quality of Bokeh it yields is absolutely beautiful) which I used as a portrait lens on my 7D before the 6D arrived and stole the portrait shooting away and took over the 50 as a great walk-around lens. I also everything I need in the 70+ end, but nothing in-between the 14 and the 50. I've been filling in by renting occasional lenses at ProPhotoSupply in Portland, OR, where I can rent even the 24-70 2.8 II for $30 from Thursday evening through Monday morning (I'm lucky to live quite close to them). I've been eyeing the Cameda Camera deal on the 7D Mark II, which comes with the 24-70 f4 IS, but lacking a Canadian address, I'm not sure if I should try to go through with it.