I have a Viper Remote Start with Smart Start on my Ranger. i did not spring for the alarm.
The viper system is really nice. the KeyFob is not some gimmicky hunk, its low profile, nicely made and subtle, the one i got is one way AM, and it exceeds the range of my former CompuStar FM remote.
The system comes with a very bright flashing LED that 'emulates' an alarm which is nice if you decide to forgo it and do the rest later.
The smart start is awesome, any smart phone (iPhone in my case), you just open the app, you can get two way verification that the truck is locked, unlocked, and remote start (or stop) the motor right from your phone, from anywhere there is cell service.
when i leave work, i have to take a bus to the employee lot. its a 5 minute ride, and its out of range for any KeyFob, so the smart phone system is really sweet. plus you'll never have that nagging feeling "did i lock my truck?"
they keyfob looks like this only without the gray outline, and the new version is somewhat smaller as well...