all depends where you live, where you train (home or gym) and what they specialize in?? also do you want nutritional work done and bodyfat testing. The more you want, the greater the knowledge and skills of the trainer has to be. Education & certifications are great but experience is the key! do they have a portfolio of past and current clients that you can contact for refference - the results they get others is your best guide.
Also don't get one of those ACE assholes, they pass a multiple choice test and call themselves a trainer! I can't wait for the industry to become regulated by the state medical boards and all these "trainers" will have to pass rigourous written, oral and practical exams to get a license!!!
S
P.S. I can call ACE trainers assholes because I was one! - didn't know shit about real training but I got a piece of paper that said certified trainer and was hired. Then I got a BS, MA, PES, CSCS, watched about 300 videos from the CHEK insitiute, NASM, Ian king, Westide Barbell, Dave Tate, trained with USAW, went to dozens of seminars and try to read every book Charles Poliquin. Dr. Colgan and anybody else with a brain and now I am finally getting the confidence to consider myself a real trainer but not done yet -starting Neuromuscular therapy certification next week and hopefully my Phd next year! This is the type of dedication you want! someone who lives to make themselves and others excel not a friggin part-time actor/teacher/garbage man etc. who trains for a few extra bucks and gets the all info from Joe Weider! (I F'in hate Joe Weider!) - shit I gotta lay off of the clen and caffeine; oh well hope this helped.
Good luck and keep us posted!