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I don't think they make an in-dash replacement for the GS since it controls other functions of the car too. It'll be harder and expensive to produce a replacement that offers navigation and controls like HVAC control on such an unpopular car like the GS. There is a aftermarket replacement unit for the IS however since it's more popular car, it's more cost-effective. Forgot the link for that one, but it does seem to give even more functions than a stock navi does.
wow 2k to add it. i say get the vais with video output and use your phone as a video out source so you can see your nav from your phone onto your screen in the car.