i have a 2001 f150 and looking to get a alarm/remote starter. i have read about viper, autopage and clifford.

whats the difference in the viper 791xv and the viper 5900.

also i like the warn away low volume signal warning for possible threats on the cliford, does the vipers come with that or do they just go off when someone breaks in.

the autopage i looked up isnt bad for the money either i dont think comes with dual shock sensor, glass break sensor and temp sensor the other alarms dont come with those sensors correct.

i really would like to have two way remote but if i can get a alarm with more features without 2 way paging for a good price i will go that route. out of these alarms which is the best bang for the buck

http://cgi.ebay.com/Autopage-RS-900-...1%7C240%3A1318

http://cgi.ebay.com/VIPER-5900-2-WAY...1%7C240%3A1318

http://cgi.ebay.com/VIPER-791XV-2-WA...1%7C240%3A1318

http://cgi.ebay.com/NEW-CLIFFORD-MAT...1%7C240%3A1318

i have also looked at the kc alarms and wouldnt mind getting one of those since i can use my keypad still, so if u have one of those tell me about it, and i will get my alarm installed somewhere