Here's a couple places I've found and that people have mentioned. Good lady spots and scoring waves.

http://www.balanganseaviewbungalow.com/places-to-visit/
http://www.balisurfingcamp.com/bali_surf_spots.htm
http://www.g-land.com/
http://amangatihotel.com/amangati-balangan.php

http://www.mentawaiislands.com/contact/
-Pp Flight $2300 w/ boards. Accommodation w/ everything is about $3200. Probably another 1k for transfers, taxes, photos, etc. This is where the Billabong team goes....