I have no interest in running down to a shop & dropping $600 for an alarm, just as I have no interest in running down to a shop to pick up a 800w amp for $800, when you can pick up a JL Audio 1000/1 for $300 and blow everything away, just as you can get a yester-years alarm for a 1/3 the price just because it was made in 2005 as opposed to 2012.
So with that in mind, there was a famous Viper alarm from the early 2000's everyone wanted and people even want till today, yet can't remember the #. Doesn't have to be a Viper, or all that fancy. Other then door locks, kill, and wanting to add a proxy sensor, I can't think of anything I really need unless there's some really kol/stupid awesome functions happening now-a-days.
I'm on the fence about those ~bulky (digital read out) key fobs.....don't know if I want to be pre-occupied staring at my key fob every 5 mintues to see if my cars been touched.