I got the Viper 791XV. Pretty much the same as the 591 except it adds more Aux channels and some other minor stuff. I too have a battery backup siren, with two mini pain sirens on the inside as well(highly recommended). My brother had one pain siren inside his truck and I didn't feel like sitting in it any longer than 5 seconds while it was going off. Very uncomfortable.
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~Justin~
J-ville, FL
"If at first you don't succeed, cheat."
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