I have been eyeing the 50 1.4 from Canon and Sigma, I would also be open to other suggestions
The Sigma 50mm f/1.4 is optically superior to the Canon (it's in the same league as the Canon 50mm f/1.2L). It also AFs much faster since it has a true USM instead of the Canon's micro motor USM technology.
However, the Sigma 50mm f/1.4 does cost more and there are more quality-control issues associated with it...namely, it's hard to find a copy without front or back-focusing issues. And since you don't have a camera with AF microadjust, you can't correct for any AF defects.
I would also recommend you looking at the Sigma 30mm f/1.4, which acts like a 50mm lens would on a full-frame body. The Sigma 50mm has the field of view of an ~80mm lens on a 1.6x body, which is a bit long to be considered a "normal" lens.
As far as wide-angle lenses for 1.6x crop cameras, zooms are the best way to go. Tokina 11-16mm f/2.8, Canon 10-22mm, Sigma 10-20mm, and Tokina 12-24mm f/4 are all popular choices.