Haha this is covered A LOT on stereo/alarm install threads.
Problem with the stock stuff is it's master/slave, not a "true" power setup (the drivers side door has no power mechanism, just the passenger side).
You'll need a "power door lock" actuator for the driver's side, might as well just get a pair and install on your existing lock setup.
Then you'll need an alarm to actuate them, and a couple relays, cause that's what's cool. Total, <$100 if you do it right.
www.the12volt.com is your friend here.