There are always cheaper options available, but it really depends on whether you want to bite the Bullet and get it over with, or get something that will be enough.

The 08+ box I mentioned will bolt up, should handle the power without a hiccup, and cost 1/3rd as much.

The 6 speed is a more long term solution for sure if you're going to go beyond what you have now. It handles power like a champ, however weighs a fair bit more.

Sent from my LG-D802T