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17-40 but thinking of getting the 16-35. It's great shooting wide on a FF camera

17-40 f/4L for me, too.

I don't know why you'd get the 16-35 if you already have the 17-40, it won't make much of a difference as far as field of view is concerned. It might help with indoor shots if you're talking about the 1 stop and IS difference.
 
For me its between the 18-135mm and the Sigma 10-20mm. More recently the Sigma has hardly come off my camera - I love super wide angle photography
 
My 70/210 Sigma f2.8 APO stays on my D300 most of the time as its my favorite lens (Great for portraits and other stuff) - I love its rapid handling and crisp resolution :)
 
70-300mm f/4-5.6 IS USM on almost all the time, but I just hit the purchase button on a Tokina 12-24mm f/4 so I'm hoping that will spend an equal amount of time on my camera starting this weekend.

50mm f/1.8 and 28-105mm f/3.5-4.5 rarely see any action.
 
A Sigma 17-70 is on my 400D almost all the time since I picked it up for a fraction of its original price in Japan - excellent place to pick up like-new 2nd hand lenses! Although on occasion I feel inspired enough to slap on the nifty fifty (Canon 50mm f/1.8).
 
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