Metzler Roadtec 01. For street riding just get 'em and be done.
For reference:
2006 S3, NW USA (regularly damp, never over 100 degrees), street only, commuting, weekend warrior will touch pegs occasionally, one long (2,500 mile) trip every year, no track.
Prior tires on this bike:
Pilot Power (non 2CT): Fine. Nothing amazing, but no major complaints.
Dunlop Q3: Very good. Better feel than PP. Loved the feedback. Not great when cold, especially not wet in the city because you can't get up to temperature hardly at all. Overall very good. Only because of poor cold performance will I not buy again for commuting in the NW.
Dunlop Roadsmart 2: Once warm they are excellent for street use. Will touch pegs, great feel, great mileage (would do 8-10k), would honestly have a hard time telling the diff between them and Q3 on the street, I'm sure it would be different on the track. All this is once they're warm... they're super stiff (dangerous in the wet) until they're warm. Only because of this slow warm up will I not buy again.
Michelin Pilot Road 4: Hated them. They need zero warm up, and were perfectly good... until you used more than 75% throttle or cornering, or (may Siegfreid help you) strong throttle while at more than a casual lean. Google PR4 Squirm to read about it. I sold them after less than 1,000 miles just to be rid of them. The 7 bikes who park next to me who use and love them couldn't believe it. Never again, even for free.
Current: Metzler Roadtec 01. I was nervous getting them as they were brand new with only a few European sources having provided any sort of (non sponsored) review, and I spent many hours on google translate working through what they were about. I love them for street use and will buy them again and again. Period.
No warm up needed to have useable grip, even on 50-degree damp days (it hasn't been colder than that to test them). No problem "elephant hunting" the chicken strips off, and dragging toes at will on crappy roads. No squirm at all. Very usable feedback, but not as stiff as Q3. Immediate and complete comfort and confidence. I've only put on a couple thousand miles so far, but wow; what a huge difference suitable tires make!