string gauge is a personal thing. i use 11-50 on all my electrics and 12-54 on my acoustics. i can play 10s, but 9s feel so wimpy they are hard to play for me. i blame slash. he was using power slinkys, so i started using them. he was tuned down a half step on a les paul and i was in std on a strat. i was also 13 and just got a guitar so didnt know any better, and now its what im used to