I would recommend making friends with someone familiar with properly installing after market electronics. Theres a right way and a wrong way, and getting hands on training with someone experienced is ten times better than looking at words on a screen.
I don't recommend a LOC unless it's an AudioControl LOC. Most of the rest are cheap junk that have been proven to cause distortion, but sell because it's cheap and "gets the job done".
Do you have the factory HU, or are you using an aftermarket HU? What subs and amp are you looking at getting?