Custom Registration Form

Okay, I know this has been asked and I have read and read so many sites and plugins, from buddypress to CIMY Extra Fields. I am working with Wordpress 3.5 and Membership Pro. I really would like help on the best plugin or solutions to adding extra custom fields to the registration form. I can code so if that is the best solutions so be it, but would love to know if I can pull off a plugin to solve the issues, I tried BuddyPress and perhaps missed, something so a link would be great on some detailed info, I tried CIMY and nothing seems to change so not sure if it is the membership plugin handling the registration causes the issue or what? I throw myself at the mercy of the court, any advice out there?