I wound up going with Conti Ultra Gator Skin 700x28s and have put about 50 miles on them since I put them on. They feel faster than the Specialized All Condition 28's they replaced, but also less comfortable. I assume both are because I'm running them at higher pressure, about 100 in front and 105 in back (max is 116 IIRC). I'm going to drop them down about 5psi each and see how that feels (I ran the old tires at 90/95). So far I'm happy with them, time will tell if I stay that way.

Once again, thanks for all the advice!