Well it depends on what you mean "best" and "affordable". I will boast DEI stuff all the way. ALL of the main brains are the same in all the lines (Viper, SIdewinder, Python, Hornet, Automate). Some you will find cheaper than others and the Hornet is the only one (well Valet too) that you can buy and install yourself. They are also the only ones that come with a 1 year warranty. All others have lifetime warranty but need to be installed by a dealer for the warranty.
I have installed many different makes and models of alarms from Codealarm, Clifford, Excaliber, Bull Dog, AudioVox, AutoPage just to name a few. All of the others seem to have their quirks.
Remember, DEI didn't become the #1 rated electronics company in the world by mistake
