So my lens collection is slowly growing, and I want to make sure I'm getting "the most bang for my buck". Eventually, I'd like to upgrade to a full frame, but am content with my crop sensor T2i for the time being.I know that the full frame cameras only accept the EF mount, so any EF-S lenses I have will pretty much get ignored. All that being said, is there ever an advantage to using an EF-S? From what I've read, "experts notice little to no difference in end result" and it seems like the EF-S mounts are "cheaper". Am I right to assume I should continue to purchase EF mounted lenses and forget about the EF-S mounts?