I recently purchased the Dunlop SP Sport 5000 tires from The Tire Rack, and while I haven't had them installed long (just this morning), so far they are excellent. I know I'll never use their W-rated abilities (up to 168 MPH), but the road noise and handling is superb. Much better than the crap that was on there.

Next up are my brakes; I purchased some EBC Greenstuff brake pads which should virtually eliminate brake dust. I'm also going to flush my brake fluid. These two things combined should be a big improvement (I'm hoping).