Best aftermarket alarm?

What is the best aftermarket alarm out there for an 03 X?

Thanks

Viper (DEI)- model number depends on what features you want..

Make sure whoever installs it soiders all conections, takes alittle longer, but much much much much much better than T-taps.

if you have the cash, back up battery for the alarm, is a huge plus. However make sure the siren is hidden so well that it can't be yanked out from under your hood in seconds. otherwise it takes 2 people just seconds to smash your glass, pop the hood and yank out the battery wire or siren.

Clifford's G5 line (not their DEI models).