I found some really cool chips on www.parallax.com. This is the company that makes the basic stamp. They have something called the IR buddy. The makes wireless infrared transceivers very affordable, and easy to use.

The pair of IR transceivers is about $60 USD and the code for the basic stamp is included. This code can easily be used with pic basic pro as it is upwards compatible. These IR buddies have onboard microcontrollers to buffer incoming data. It is able to work on at least 4 different carrier frequencies. The onboard microcontroller makes it really easy to communicate bi directionally with stamps or pic microcontroller.

I may go this route instead of the rf route. Because this way I can now have bidirecitonal communication. Cheaper than I can have simplex communication with the rentron rf modules.