10-52's, 11-52's, or 11-54's for the most part. I also have some guitars with plain 10-46's, one with 9-46's, one with 13's (wound G), and one with 15-58's, which is primarily used for getting the Dick Dale sound.
For acoustics, 13's for everything except my old Martin parlor sized koa guitar, which requires silk and steels in order to hold together. Acoustics are all about tone, and nothing gets the most out of an acoustic like 13's. I will sacrifice some ease of play to get the best tone out of an acoustic.