check out www.autotoys.com
They go alot of alarms and they have tech articles for it.
Check out the thread for installing an alarm in a 5 gen civic here, i posted the wiring info you will need if you do it your self. Look into the alarms with a pager, i wish i got one of them now. I have a prestige alarm and it is really loud, also has ignition kill. If you read around you can also make a kill switch for your fuel pump too, which is real easy to do.