Re: Best alarm for under $150
any alarm made by DEI (viper, hornet, clifford, etc) is a very well designed solid product that when installed well will provide great coverage for your car. The least expensive models have keyless entry, door trigger, and a shock sensor that gets very sensitive if installed right.
for a little more money you can add a prox sensor, glass break sensor, power window controls, etc.
there is a reason DEI makes up about 95% of the mobile alarm industry (percentage is made up,. but I think is in the ballpark).
Kenwood Excelon x811
CDT Audio HD-62 in custom kicks
MTX Amp for CDTs
??? need to decide on a new sub