Hi Gabriel!
I went through this same process with the 24-70 f2.8 just a month ago (except I bought it for a family photo shoot not a wedding). The 24-70 f2.8 is my favorite portrait lens that I own and is almost constantly on my camera. As a small side note, it is heavy, Really heavy! For me this is not a huge deal, as I like heavy lens and cameras. Just a thought for you to consider.
Anyway, back to your original question. : ) I bought my 24-70 f2.8 from MPB.com (for $704), who had it priced lower than anything I could find on ebay. It was listed as in good condition, but after examining it I would have listed it as in mint condition! However, after doing a quick search today on MPB’s website, it looks like they are sold out. They do have a Tamron 24-70 f2.8 ($869) and the newer VR version of the nikon 24-70 f2.8 ($1,200). If you are willing to wait a week or two and see if MPB gets anther 24-70, I think they would be a great option. If you really need to step on it however, I would try to find something on ebay.
Good luck and hope this helped!
Ethan
P.S. Here is a photos of what the 24-70 looks like on my old D5000.
P.P.S. And congrats on getting to shoot a wedding!
