hmm.. good luck, for $150... especially, getting it installed. not to be a dick, but you are going to have to either save up a little more or rethink your necessities.
i would recommend any directed/dei (viper, python, etc) as they are reliable (come with a lifetime warantee if installed by an authorized dealer).
There are cheaper 2-ways like the Crime Stopper ones, but even for that price you are probably going to have to install it yourself....
I would suggest just saving up a little more ($300 should get you a nice 2-way w/ installation).
Oh and pretty much any alarm can have more piezos added to them so that is not much of a concern.