How to Megasquirt your 3G Hemi

I ask cuz I can get the msd box and harness at about 50% off list. It is easily tunable with available maps to use and adjust as needed. This is my initial idea of way I want to go. I'm completely torn on it. As I have seen lots of issues with megasquirt start up stuff. Maybe buying allready assembled is the way to go? I already have sensors just no harness.