My commuter can take a maximum 700 x 28 tire and I am looking for a new set.

Requirements for 46 mile RT commute:
a) Grippy for corners, especially for wet roads, perhaps light snow ( I usually leave it home for snow)
b) Ability to absorb the usual pot holes
c) Flat protection, prefer to NOT have to change flats in the cold (duhhh)
d) Weight is not an issue, okay it is but I do not use a light tire now