NOKIA s60 sat-nav

Anyone recommend a sat-nav package for my Nokia E51, I was hoping to use the Tomtom Navigator 6 from my E50 but it seems once it registered to a device it can't be trasfered to another, I'm sure that Route 66 used to have a license that let you install it on 3 devices.
Anyhow basically I'm looking at Navicore 2007, Garmin XT, Route 66 (if its still available for S60) and Tomtom Navigator 6 (although the licensing has put me off Tomtom slightly as I've a few S60 phones).
I know the Navicore system can be used on as many handsets as you want but only one at a time, and I'm thinking Garmin's the same.

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