Hey guys. Just looking for feedback on something I have been thinking about but haven't done anything about yet. I think I will be sticking crop sensor for quite sometime as long as it is made available due to FF pricing. I am considering selling/trading my 17-40 and 50f1.4 to fund a 17-55 for the f2.8 and IS. Many of the shots I take are of the kids indoors and would prefer a zoom to prime for convienence. A few things concern me about the 17-55......namely dust collection and IS failure. Of course not all have these issues(and the dust is considered minor) but still.....concern me. Has anyone made this switch and regretted it or would do it again in a second? Any experiences you can share would be appreciated. Thanks.