gotta find the right system

Hey all. I have gotten some recommendations, and I asked a local installer/shop guy, and he said that the audiovox aps996a has had reliability problems, and they don't carry it. But, he said, he does carry both the viper 650xv and viper 700esp. Problem is, I can't find much information on any of these. Which is better, and why? How much should I pay for either one? Thanks for any help. Matt

try better the 790xv two way responder its better than both of them because  for  one its a remote pager and it will page when the car is tampered with also it remote stars your vehicle and u can leave it armed while its in remote start. one of my personal favorites i sale them installed and everything for about 375.00 to 400.00 depending on the car with 2 pagers.dei user