-i have used many brands in these trucks, polar start, viper, command start, etc...(im using autostart now which is a nice system, google for it), all of them will work in your truck (mines a 1993).
-the benifit of your year is there is no need for a by-pass module for securtiy like there is for the newer trucks.
-installing these is pretty damn straight forward, and if you choose to buy one i can tell you all the colors of wires you will be after to wire it in (if you are capable yourself).
-as far as what one for you, just search all remote starts and alarms to see what options you want, mine is a basic one way remote with 4 buttons and thats it, it will unlock doors, pop hatch and start truck, thats all i wanted.
-let me know what you find and i can give you my opinion on them if you want and install tips. (dont buy from a wal mart or other shit store like that, go to a good stereo shop for a good brand (ones i mentioend))