Hi Guys and Gals

I am getting a new lens and cant decide between the sigma 30mm F1.4 or the Tamron 17-55mm f2.8.
I have a Canon 60d. My photos are of mainly people, cars and general photos. I have two prime lenses at the moment which are the Canon 50mm f1.8 and 28mm F2.8.
My thought is Buying the sigma and I have no worries about using my feet as a zoom. I will sell my two canon lenses.
Or the second option is buying the tammy and keeping the nifty fifty for low light .
Pros of the Sigma is one lens on the camera which reduces dust entering camera.
and having f1.4.
I anyone has had either of these lenses or have been in the same predicament, please let me know.

Thanks for your time