I would recommend Rob Swain - Did a course with them in Rhode Island - actually had Rob as the instructor. Was a great time.

You don't really need to focus on certification though - just getting the experience and knowledge is just as good. The certification does give a good guideline for things you'd want to know, but isn't necessary. The course we did with Rob was really for friends and was the basic keelboat course and is the only certification I hold and I've still captained boats up to 58'.

You could probably get just as comfortable on a week long trip with the right captain and having them go over things with you. So no reason not to use Capt Compass if they can still work with you to provide you the knowledge you need to captain the boat yourself.