I've just had a 480XV viper pager alarm fitted (£400 from GAP security, including fitting at my house - I don't let her out of my sight lol)..
Does everything, locks/opens doors, door sensors, bonnet sensors, boot sensors, interior motion sensors and tilt sensors too (jacking cars up to steal the wheels can be detected). It also pages the FOB (two way communications) to alert you to any trouble, within a mile of the vehicle. Can tell you what doors or if the bonnet/boot is open, if the interior sensors are picking anything up and if the ignition is being tried too!
Well recommended, although I've had a few niggles with the fitment (*edit* not posting these details on second thoughts lol *edit*), I'd say thats just pot luck... They have an engineer coming out asap to fix it.
Dave