Experience with all of them yes.

This would be my suggestion.

Buy the 6D, if you want to get the 24-105 package cheap do it, then sell the 24-105. I have seen them going for about $825.
Sell your 7D and your 17-55mm. Take all that money and buy the 24-70mm f/2.8 II. After a month with this kit you will never doubt your decision.

F/2.8 on a crop body has a much wider DOF. You will notice the increased performance and abilities you will have with the full frame camera over the 7d. Keeping the 17-55mm because it can go to f/2.8 on a crop body when you own a FF, doesn't make sense.

There are a few reasons to keep the 7D if you go full frame 6D. The reasons would be back up body and if you need a sports camera with the illusion of extra reach.

As a backup body it will probably collect dust once you get the 6D and the 24-70mm II.

Stay away from the 24-70mm original, there are better lenses.