I have a commando alarm (501-s
for $50 it can\'t be beat 
) (don't laugh, i'm serious) and it works pretty well. I bought it mainly for the keyless entry and trunk popper, but it works great as an alram. the brain is very small and fit nicely concealed on top and behind the fuse box. Its impossible to see, you can only fit your hand back there. It was very easy to intall (only 10 wires to splice, the whole thing took only 3 hours) I taped the alarm harness to the ignition harness, and the wires are all mixed up..its extremely hard to tell which wires go from the fuse box to the iginition and which to the alarm, the shock sensor is actualy surprisingly sensitive also...any alarm will work great, just do your research and ask questions. A lot of people are more than happy to show off what they know.