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Absolutely get a second body. If this is a one-time thing, you might even consider renting one. But, either way having two cameras is much better - there's no do-over - if a lens stops working, well, you can move more and still get shots. If your one camera dies, you're done - and will likely have a very unhappy couple! The other main advantage to a second body is fewer pauses to change lenses.


The EF-S 17-55mm f/2.8 IS and theEF 70-200mm f/2.8L II IS are excellent lenses with significant versatility. 200mm on a 1.6x crop might be long indoors, but during the ceremony you may need the length if you're shooting from the back of a church. Asecond the recommendation of a fast prime, 50mm f/1.4 or 85mm f/1.8. The 85/1.8 is an excellent lens for tight portraits (head/shoulders) on a crop body, but the 70-200mm will cover those, and usually you want wider framing at a wedding to show the bride's dress. Consider the 35mm f/1.4L, too, although it will take a substantial part of your budget.


You might also want to consider picking up a 500D Close-Up Lens for the 70-200mm, for hand/ring shots (the 0.21x magnification of the 70-200mm would be enough, but the MFD is 4 feet which might be a challenge - the 500D lens changes that to 20", a more convenient distance). I've used a 500D lens with my 70-200 II, and the results are very good.


For convenience, consider something like a BlackRapid double strap - slinging a body + 70-200 2.8 around your neck with the Canon neck strap will not be comfortable or convenient.


Only other recommendation would be to decide and purchase soon, so you have time to get comfortable with the new gear.


Good luck!


--John