As far as I know, you will be able to shoot with all the lenses you have minus the 18-55, and 55-250 since they are a EF-S lens. As wuzzittoya said, you can actully use the three other lenses and get good coverage. Id look into getting a 17-40 or a 16-35 depending on your budget, I would go wigth the 16-35, PLUS there is a rebate on that lens aswell right now of $110.
Ive shot with the 1d Mark IV, and I want its TERRIBLY bad, I am waiting for the price on it to drop considerably till I buy it though, as soon as the price drops, I will snatch it up! Dont sell the 7d though, you should always have a second body, hince why I am wanting to buy a new camera so I have a second.
I currently have the 7d, and I am stuck on if I should buy th 1d Mark IV or the 5d Mark II, or buy both, I would have full frame, crop of 1.3, and a crop of 1.6 if I did, so I could use the 16-35 on the 5d, 24-70 on the Mark IV, and the 70-200 on the 7d, its just would it be worth it to me to have 3 cameras? haha, these are the things I think about daily.