I have searched both Google and on here for an aftermarket alarm system that replaces the factory OEM transponders my vehicle the 2001 Ford expedition EB does anybody have any personal favorites or Ones they've used and really ?

I want an aftermarket alarm system that the transponder controls all my locks and unlock etc. functions. I'm on a $200-$300 budget

Just installed a lot of new stereo equipment and a much larger more expensive supercharger that's the reason for wanting to ditch the OEM alarm system

 

you get what you pay for, like most things. clifford is my brand of choice. things like glass break, shock sensors, back up battery, infrared, and most importantly a pager. but what i have learned being in the car scene is that if someone wants your car they will get it. you can get a detachable steering wheel, club, clutch lock, yada yada yada but at the end of the day all they have to do is pull up in a flat bed. be smart about it. dont bump coming into a parking lot, parki in decent areas, etc