Brant-


I own the 17-55mm f/2.8 IS and it is my main go-to lens (I own 3 zooms and 3 primes). It is the best general purpose lens for a crop sensor. Even though it has a wide maximum aperture, however, I wouldn't consider it a "low light" lens. By my experience, it tends to hunt for focus when the ambient light is dim. Therefore, the 85mm f/1.8 you mentioned may fit your needs better (that is, assuming you have the room to work with it).


That said, it is indeed a very good price--and the lens is well worth the investment if it's going to be used.