@
stock
Like some have alluded to, grip has more to do with tire compound than tire width. If you want to keep the fun street character of the stock car on a wider than stock tire, I'd choose something with less ultimate grip and better wet performance for the street. I also wouldn't go wider than 235 because many have reported at about 245 you may start to lose steering "feel" (the sidewall aspect ratio, and construction will also play a part here as well as tire inflation pressure).
So for what you're looking for, I'd drop down in the range of "ultimate grip" and get some of the "fun" back you're seeking.
Performance Categories (per Tirerack)
http://www.tirerack.com/tires/types/tiretype.jsp
Extreme Performance Summer (some examples)
Direzza Star Specs
Hankook RS3
Bridgestone RE-11As
Fastest
http://www.tirerack.com/tires/tests/...y.jsp?ttid=172
Max Performance Summer (some examples)
Michelin Pilot Super Sports
Bridgestone Potenza S4 Pole Position
Sumitomo HTR ZIII (
Try this)
Fastest
http://www.tirerack.com/tires/tests/...y.jsp?ttid=174
Best Budget
http://www.tirerack.com/tires/tests/...y.jsp?ttid=149
Ultra-High Performance Summer (some examples)
Yokohama S.Drives (
or Try this)
Bridgestone Potenza RE760 Sport (
or Try this)
BFGoodrich g-Force Sport COMP-2 (
or Try this)
Fastest
http://www.tirerack.com/tires/tests/...y.jsp?ttid=163
High Performance Summer (some examples)
Barren Wasteland
Grand Touring Summer (some examples)
Michelin Primacy HPs (Stock Tires)
You may also explore All-Season tires if you're in a place where the temps often drop below 50 degrees. Ambient temperature performance also plays a large role in how much grip is available throughout the performance envelope.
Hope this helps a little.