Whatever alarm you get, a lil fuel pump kill switch would be great also. A battery or ECM kill is ok but resets the Chip. I'm planning on making a remote hidden switch to work with the Keyless entry unit or AUX on the alarm. It will kill the power to the pump without having the switch under the dash, hidden in cab somewhere,even under the ashtray etc. Also might do it to the starter or other "start" parts. It wont stop a Tow truck but I never leave it long enough for them to use one. Depending on how much you want to safe guard it, look into lowjack.
A custom job is always the best IMO, nobody will know about it but you.