Choosing a member of the CAI doesn't guarantee you a good job but it may improve your chances. Whatever you do, don't pick one from the Yellow Pages who's ad involves crazy '.......0000AAA111' type gimmicks which get them to the top of the column. They're usually a**holes!
I always find it's better to go on a recommendation. If you can't wait for one from anyone in your area, pick someone who looks decent and phone your local Trading Standards Dept. before you call them. They will be happy to advise you if they have 'history'.
Hope this helps.
A. Dork