My hair is still short but I will need a solon that will not cut it off in December/January when I go to get just a slit end trim.

I know that when I used to go to Phillip Pelusi's salon, they wouldn't cut or trim my hair unless I asked them to.  Although, no salon that you go to should trim anymore of your hair than you want them to.  Just make sure that they understand and will agree to exactly what you want before you let them do anything to your hair.