Bueh B. , Feb 15, 2011; 04:02 p.m.
Get the Tokina. It is an excellent super-wide zoom made for APS-C cameras. The EF 14mm is a special full-frame AF ultra-wide built for a field-of-view "where no rectilinear lens has gone before". It is unique and well regarded on full-frame where its optical drawbacks are part of the deal, but for APS-C there are better alternatives.