If you have the 70-200 F/2.8 (sheesh. . .how many kidneys did you sell), I wouldn't bother. First ask, where are you using the 16-85. I see you have the 50MM, so I can't imagine you are putting that away to swap to the 16-85 indoors. So if the 16-85 is staying on OUTDOORS, there's no light concerns. Perhaps on cloudy days, or near twilight, but then thats when you whip out the F/1.4 anyway.
It's funny - I just grabbed a 80-200 F/2.8, and I'll be damned if its left my camera in the two weeks I've had it. When it has, usually the 50MM F/1.4 goes on. Like you, the other lenses are situational and outside what I'm usually hitting. So, long story short, save your money, and invest in a Speedlight instead.