First off, thanks to everyone who has been contributing...there is some phenomenal information floating around here. That said, one thing I remain confused about it whether I need the I-Pac or J-Pac for a totally custom build I am doing. Not working from an existing machine or anything, and only need two players. Does the type of joystick I get dictate whether I need I-Pac or J-Pac or is it all irrelevant since Im not working from a cabinet with already existing components? Ive searched around and tried to see if anyone had similar questions but didn't see anything. Thanks