I have a Trek 1000 WSD and have been riding on the Bontrager tires that came on the bike (700x25). I want to replace them this spring even though they only have 800 miles because the back tire has a growing gash...and there are alot of sales right now.

I'm looking for recommendations for 700x23 that will hold up to city conditions (crossing railroad tracks, road debris between street cleanings, etc). I'm riding for fitness and last summer my typical ride was 15-20 miles, which I hope to increase to 20-30 miles. I've read about Kevlar tires, but am not sure where to begin--brand name, price? I've also looked at reviews on RoadBikeReview but sometimes that only further confuses me. I am open to all and any suggestions, or redirects to other threads.

Thanks!
S