that's originally what I was planning on. however, i realized that I don't really need 2.8 for a wide angle lens, and that's a pretty limited range.

the 11-16 is ~$569, and I just checked today, and the 10-20 is $421 @ amazon.

I'm convinced I have an updated version... doesn't look like any of the other 10-20's i've seen. performance seems to be enhanced as well.