Longtime member here but mostly I do bird photography. My wife and I are heading to Europe this summer and I think it would be a great chance to change up my photography style as I've always loved macro, landscape, and everything in between that captures the feel of the city. We will be in Paris and Rome walking around most days. I want just ONE lens/camera and I think no flash or tripod for ultimate portability. Right now I use an XSi and 400mm lens for my birds but I'm thinking of getting a 5D Mk II (used) as they are going pretty well on Craigslist now and are a great camera. Here's the big decision: which lens to get? The three choices: 1. 24-70 f/2.8 Mk I 2. 24-105 f/4 IS 3. 16-35 f/2.8 Mk II I'm leaning toward 1 and 3 as I love low light and see myself taking lots of wide angles but will not have a flash or tripod. In terms of the 24-70 vs 24-105 debate I've always kind of enjoyed the 24-70 more when I've borrowed it but my main concern is if it will be wide enough for city usage. Anyone else have input for a good carry around lens for the cities of Europe?