Could people here who are in the know please recommend to me some alarms, along with what they cost?

I'm interested in getting one with a dual zone proximity sensor. It could come with the unit or as an add-on.

I was considering the Alpine SEC-8063, due to the nice display with the clock, but the local dealer wants $399 plus installation and proximity sensor for a total of over $650.

If anyone who lives in South Florida can recommend a place, please do!