I know this may seem like a stupid question to those of you more familiar with these products but I was wondering if someone could explain to me the difference between the Edge EZ, the Edge comp and lastly the TST Power max 3. I managed to talk the wife out of some of the tax refund and would like to spend it wisely. Only have about $700. 00 left after I order my gauges. I like the idea of being able to adjust the power level from inside the truck but is it worth the money? Would also like to know witch is the easiest to hide from the dealer, as warranty is still an issue. Any help would be appreciated.