85 isn't that fast for a modern tire. I think the lowest speed rating is for 120.
For a DD, I highly recommend sticking with an allseason tire. It's not going to have the dry grip of a summer tire, but you also won't have to worry about wet traction. If you're on a budget, I recommend Kumho ECSTA ASXs. For 245/45s, they're less than $100/tire, and they're speed rated.
I also don't suggest going to a wider-than-stock tire unless you're competing in some shape or form. While increasing dry grip, wider tires *decrease* wet grip and increase rolling resistance (which translates to lower fuel economy).