As much as I would like to get another 24-70L, most L glass is out of my range now, Even the EFs 18-55 2.8 would be pushing my budget very hard. I was looking at the next best thing to Canon glass, and that is Sigma. I have owned Sigma in the past and have liked them. I was looking at either the 17-50 2.8 or the 17-70 2.8-4. I am not looking for native EFm glass since I hope to some point to move back to a full-sized crop camera. I had a line on a well-priced 24-105L, but it sold before I could get it. Suggestions? Other options?