I personally would go for one that looks modern and a good shape like a texecom odyssey 3. They all have leds and strobes that do the same job as each otherhttp://www.texe.com/view.php?page=49
Whats really important is how blooming loud it is!!!!!!
LEDs might look pretty but they wont scare mister burglar...
IMO you should either have No sounder ( Monitored by alarm company )
Or the biggest loudest siren/bell you can get hold of, better even have 2 outside and a very very very loud one inside..
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