If you get a kit lens with the 7D then make sure you get the 15-85mm IS USM(it does come as a kit with the 7D). I have the 28-135IS and it's a decent walk-around lens, but that's on a 30D. You don't want to buy a very expensive DSLR and put a low end consumer lens on it like the 18-135(the 18-55IS kit lens is slight better) or have a poor focal length choice in the 28-135IS. Probably the best choice would be to get the 7D with no kit lens and get the 17-55mm IS USM, but that kicks up the price more.
If you don't have enough money to get a lens that's better than mediocre for the 7D then you should think about getting a 50D instead and buying better lenses, because the lenses will make a bigger difference in the image quality. The Canon Rebel has the same image quality of the 7D and with the money saved, will make it a much better camera in the image quality department. If you need it for sports shooting then plan on spending a lot more money for sports lenses. If it's just for casual shooting then look at the T2i or 50D, which both will perform just as well as the 7D for casual shooting.
I'm buying a Canon 7D. I have a choice, same price, of a 18-135 or a 28-135 UMH lens...both are f 3.5-5.6. I'm leaning towards the 18.....any suggestions? Thanks