@Geoff: If you take a look around, I think you see several people already have the 7D + 5D2 combo, so I don't think I have to vouch for the quality of the combo. I think the question you should ask yourself is: do you absolutely need the most tech-advanced FF body in the lineup?
If you want the latest camera and could afford to wait a bit, just save up and take a dive when the price is right (though I doubt there's much room for price drop in the first year).
If you just want to have a good starting point in the FF lineup w/o selling an organ, I'd say wait for a while and pick up a nice, new 5D2 at a good price. In a way, I suspect that Canon is trying to make this camera the "affordable" FF body, so they'll probably keep it in the lineup for a while and find a way to lower the price further, making more people jump from APS-C to ff.
Sure, you probably can't enjoy the 61 AF and 6 FPS and the better ISO, but it's still an FF body that gets the job done.
This approach also gives you some room in terms of lens choice. Looking at your inventory, the only lens you won't be able to use on the FF is the 17-55. However, given the load of 5d2/5d3 kits, finding a good deal on a new 24-105 won't be that hard (who knows? You might consider purchasing the kit yourself).
As for the older lens, you can probably get rid of it with your 7D if Canon comes out with a speedy full frame body, or keep it if you switch to 7D2 in the future.