I put the a1 electric power windows in my truck 3 years ago, and they're still going strong.
To answer your original question, I bought an aftermarket RKE kit on ebay. Had to put the solenoids in the door frame, run the wires back to the module (which I mounted under the dash), and installed 2 relays (think they came with the kit). Overall it wasn't that bad, but I did it at the same time as my window install and had everything torn out.
Also... I hate my aftermarket lock kit. The solenoids bolt onto the lock rods in the door by this small brass block with 3 screws, and the thing is held in by the tension on the screws. It does NOT stay put... the screws back out. I even put red locktite on it and my driver side door still came undone... i've given up on it and only use the power lock for the passenger side door.
2004 Ranger EDGE, V6 SOHC, 5 speed | Mods: Explorer OHC, Turn Signal Mod