Canon 24-70mm f2.8L or 17-55 f2.8 IS

[sonofcoco]

Hello folks,

Just me asking for some advice again! Am currently considering the 24-70 f2.8L but, as is usually the way, have been distracted by talk of another lens - this time the 17-55mm f2.8 IS.

Have noticed a lot of people recommend this on a crop sensor (I have a 40D). I have the 10-22mm and thought this'd be a nice fit with the other lenses I have (have the 70-200mm f4 too). Am not too concerned with fitting in every focal length, but thought having a bit more on the longer end could be handy in certain situations.

Am looking for something I can take to markets, festivals, events and the like and get some decent shots.

So, I'd be interested in what people's opinions were on here re: using one with a crop sensor. It's possible I could get either at a decent price compared to Oz before leaving Korea.