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My only tips.. don't buy an EF-S lens, you won't be able to use it on a full-frame (5d, etc) Canon.
Also, your 400D has a 1.4x FOV crop factor.
This means the effective length of all of those lenses needs to be multiplied by 1.4.
a 24-70 becomes approximately a 34-98, and etc.
Keep that in mind. For a single carry lens, in my opinion, 34mm is not wide enough.
The 17-40 L (F/4) makes a great carry lens, but it does not go long enough for a lot of shots.
I just rented the Sigma 18-200 3.5-6.3 so I could give it a try. I haven't got to take any pics yet though, I'll post a comparison when I've had time.
I certainly don't expect it to produce the quality of images that I've come to appreciate from the 17-40 L, but it has a very nice range on it and it's very small and lightweight.
You also might want to look into the 24-105 L, it's an f/4 lens with IS.
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