As mentioned in my previous post (I think) I spent 8wks or so during mid last year in Europe (Croatia, Vienna, Prague, Germany, Oslo, London). However, at the time I didn't own a DSLR (I do now, after regretting not having purchased one for Europe). The areas visited were mainly full of historical architecure, and I didn't venture out past suburbia. From my experience of the places I have been to, I would really like to go back there with my 10-22mm and 24-105mm. If you're shooting architecture, I would of thought you'd want someone nice and wide? I know that's what I would prefer. Correct me if I'm wrong. Earlier this year I went to Malaysia and India. I took with me my 10-22mm & 24-105mm, and left the 70-300mm (aka "doorstop") at home as I knew it would hardly get used and I couldn't justify the extra weight. When traveling with camera gear, it really depends on where you stand in terms lugging around weight. Maybe do a trial? Maybe take all the gear you plan on taking, and walk around with it for a day taking shots around your local area. That may help in deciding whether weight is a factor for you. The other thing is, you seem to also have the 17-55mm. The 17-55mm maybe be perfect for your general shooting and keep the wide angle sigma for when it's really needed. But if you really feel you need the 55-250mm, and your wife isn't going to rant all through the trip about having to carry your gear, then by all means why not! All the best with your decisions and planning!