Mongoose M60 series here. Paid $260 and watched (er.. helped) a mate put it in.

I am finding the shock sensor very sensitive, and possibly dependant on temperatue? During the day it seems to be adjusted perfectly, but often loud cars / bikes / sound systems set it off at night.

Apart from that, it has all the features, and is reputed to be a nice alarm. Insurance approved (or so I was told), which is apparently useful.