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Originally Posted by Miketown
#1 would be the better choice, I think. I have both of those lenses, and they work quite well on my 1.6x crop body (7D). The 28-300mm is a compromise lens; image quality with the other two is better, and you gain 100mm on the long end, and 4mm on the wide end (and that 4mm is noticeable).
Originally Posted by Miketown
Yes and yes. Having better lenses will improve your IQ more than a newer camera.
Originally Posted by Miketown
They will work fine. Any EF lens or EF-S lens will work on your camera.
Originally Posted by Miketown
Not to add confusion, but have you also considered the EF-S 17-55mm f/2.8 IS USM? IMO, it's the best general purpose zoom on a 1.6x crop body. Reasons not to get it would be if you plan to purchase a full frame camera soon, or if you really find you don't use the 18-24mm region of your current kit lens. 17mm is substantially wider than 24mm.
Good luck with your decision(s)!
--John




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