Hi guys! I've been agonizing over what lens to get for some time now and thought I'd ask around and see what you all think. Some background - I've got a canon rebel xti and I've been shooting for several years now. I'm in art school and I work for several wedding photographers, but because of a small budget (and the better equipment I get to use through the photographers I work for) I've never gotten the chance to upgrade. Within the next year, I want to buy a 1D Mark III, but right now I'm just looking into getting my first L lens. I'm leaving for an internship in Europe and will be shooting a lot, so I'm contemplating getting an EF 24-70mm f/2.8L US, which I feel will be pretty versatile and has gotten great reviews. Do any of you use this lens on a canon rebel? I've heard it's fairly heavy and I want to make sure it'll be completely compatible with my camera. Thanks for any advice!