Superfalcon

BUMP! Did a search and this is the closest I came to the question I wanted to ask: I've bought a 2002 UK spec RX300. It has the lovely touchscreen (which for the first hour I didnt realise and was pushing buttons hoping to make it work). The screen seems to suggest that it could use a satnav but the relevant components are not installed. Right now, my TomTom looks ugly sitting on the windscreen. Is there some way I can get a Lexus satnav system added? And how much would it cost? Or would it be better to install a newer system entirely? (I gotta say I don't like the cassette system and would like something more modern.)