Middling width, 26 x 1.5" tires, around 70psi.

Panaracer T-Serv, light, not enough flat protection, especially regarding sidewalls
Schwalbe Marathon, surprising suppleness and road feel, heavy
Panaracer RiBMo, just right -- better flat protection than T-Serv, lighter than Marathon.

Riding wide slicks -- Maxxis Hookworm 26 x 2.5", Schwalbe Big Apple 26 x 2.35" @ 35psi-- was fun, da bomb, but slower and required more effort over a 19 mi commute.