Yes and don't skimp. You want someone who has experience litigating and will be able to accurately advise you on your chances of succeeding. You will probably want to use at least midsize firm if you are not located where they are since you may have more choice of venue. You will have to decide for yourself whether the expected outcome is worth the cost.
If you decide to sue never talk to anyone about this again. In my experience lawyering is better left to the lawyers.
