i'm in the market for a new alarm

My old AutoPage has finally bit the dust. I have soldered and resoldered many,many times and it'd just time to move on. I am overwhelmed by choices. Woweeeeee choices! A few questions 1. Channels...What? I guess thats like for add ons like auto window up and down or sensors for when your tops is off,etc.? 2.I had one on an automatic tranny car once. It was supposed to start when it sensed your battery was too low and stop itself when the voltage was safe so you wouldn't come out to a dead battery. uhhh...didn't work like they said. 3.Window down and up remotely. Does it just crack the window a bit to get some airflow or will it bring them all the way down for "fingers" to swipe your stuff. Now of of course, I'd like all this for like 1 $100-150.00 USA. Impossible? I just bought an AutoPage RF 425 from Amazon. I bought it on a whim because the price was right. I think I should get something more flexible,though. It's a 2 way system which I like, too. I paid like 80.00. I think. Thanks guys . Feel free to flame me for the post. I bet it's like a million other "duh ,what should I..." posts. Thanks!

BTW.93 MR2 Turbo whhich previously had an AutoPage system

Nothing, eh?