What's a better buy?

Considering there arent many reviews out yet and I cant find a comparison, I figured I'd ask. What's a better use of $900?

a Sig 30mm f/1.4 and a Canon 50mm 1.4

or

a Sig 35mm f/1.4

I use a T4i, and the only other lens I have is the kit 18-55mm and the 15-85mm. I'm not sure if the 35mm is worth getting only the one lens? Upside is also that I can use it once I upgrade (wont be anytime soon though).

Thanks!

Laz