Upload & Sell: Off
The biggest and best "lens advice" I can give is to buy a full frame body. You have a great set of lenses there, perfectly suited to the larger sensor. This will skew all your images toward wider angle, benefiting everything but sports and action.
If you want to upgrade a lens, I agree with umihoshijima, the 17-35 is the obvious one to change from.
I agree with Gunzorro