Somewhat less bling than the others, but I've had good luck running $20 Kenda Kwick 700x30s this year. The tread seems to help on grass and gravel, and the sidewalls are thin enough to give a comfortable ride on harder terrain. I've put over 2000 miles on mine without a flat, but that may be due to luck and my weight of 150 lbs as much as anything.

EDIT: Here's what the rear tire has worn down to. It sounds a lot like what you (the OP) are looking for:



- Scott