erm... plan on waiting for another $1000 on top of this to pick up the 16-35 II... It's only 1 stop slower, and seriously, on wide open, unless you're shooting motor cross or something like that, when would the 1 stop really buy you a shot when a F4 couldn't? Maybe weddings but even then 2.8 is kinda dicey... It's a very good lens overall and you wont regret it... and when you got the extra grand built up, sell the 17-40 and buy the new one. Keep it in good condition and it shouldn't depreciate too much. Plus if you want/need WA, its better getting that now then going however long without a WA option.