Looking for new lens (T2i)

That's a pretty open question.

What's your budget?
What do you shoot mostly?
Prime lens?
Zoom lens?
How wide do you typically need to go?
How long?
Do you shoot in low-light conditions, or do you normally have plenty of lighting control?

There are lots of different lenses for lots of different purposes.
 
Yes, you need to give us more info. But, i'll throw this out just to give you something to think about.
I'm finding it kind of difficult when it comes to UWAs so the 16-35L is not in stone. The Sigma..is best bang4buck and 'special' lens imo.

Canon 16-35L
Sigma 30/1.4
Canon 70-200L 2.8IS
 
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