I have the Compustar...it's a very nice unit, I don't know how it compares to the equivalent DEI model. I got it pretty cheap on ebay, but you should leave installation to a professional shop unless you know what you're doing.
BTW...the sensors that you want are all add-ons that you buy separate from the main alarm unit. Definitely buy DEI sensors (but they will still work with Compustar if that's what you choose).