Randy, here is a lipo esc for use with brushed motor like what is in you magister currently.
http://www2.towerhobbies.com/cgi-bin...&I=LXKBF5&P=ML for $39 and handles 35A. They also have a 50A for $49.
I use one from castle creations that cost maybe a little less. It can be programmed for 2 cell or 3 cell lipo as well as 4 cell to 16 cell Nicd/Nimh.

The stryker takes some getting used to but after a couple flights you'll be flying 4 feet off the ground doing big easy loops and using throttle to easily control altitude. Rolls quickly become fast and easy. Inverted flight takes only a tiny bit of push forward on the stick. Easily flies just as well inverted as right side up. You can use your pz mustang transmitter (rx and servos same also) for a stryker so you spend around $100 to have an additional plane.
I have found the AB extreme to be a little easier than the AB challenger and you can use the same Tx for both. You can build the AB X from parts for about $100 and use the AB C trans.

Carl