Seeing as you are in Largo...I would go to AVE Audio on US19 just north of Countryside Mall. Theyre awesome.

I have recently heard bad things about Buzz Off and Brandon City Stereo, no personal experience there though, I just always use AVE. They have both Code Alarm and Viper so theres a lot to choose from also, and theyll stand behind their work. They are a small 4-man shop, so you will see the same faces when you walk in which is always good.

Go there during the week and talk to JJ, he is the owner and most knowledgeable in that he will spend a half hour explaining things to you if you need him to. Vaughn is an awesome installer, went to Metra installer school in daytona and knows his shit also.

Good luck and let me know how it goes
Kevin