I'm on a crop body (60D) and sorta starting fresh for new lenses. Unfortunately as things turned out my budget for now has been smashed to bits. So here I am thinking of the least expensive worthy combo I can pick up. I already have a Sigma 10-20 and a nifty 50mm.
My current budget is around $1000 (+/- $200) and my first thoughts are a 17-40 F/4 along with a 70-200 F/4 (non IS) used.
Having read through the forums, the general concensus is the 17-40 sucks on a crop body but I've yet to read into and figure out why. If it's because it's not wide enough then that's not really an issue since I already have the UWA for my crop body. I'm looking for something cheap but sturdy. And I do plan to get a FF body in the future so it's not for no reason.
Having further read into things, I've thought about the Sigma 17-50mm F/2.8 (with OS) which is better on paper than the 17-40 but how does it do (I know this is not compat with FF like the 17-40, but besides that) quality wise; Build and image quality?
Your thoughts on the matter are appreciated.

