Rebecca,
If you've never had a remote starting vehicle, you'll love it the first time you get into a warm, defrosted car.
The factory remote starters are much better because they will start the defroster automatically. Getting an aftermarket remote starter installed would probably cost as much as the parts you need replaced, but the aftermarket systems require a separate starter fob and they do not start your defroster.
Just make sure that you turn off your windshield wipers when you shut down your vehicle. You don't want them starting up automatically if the windshield is iced over.
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2006 Grand Prix GXP, Black Cherry