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I'll bite -
For routing and directions, I've used TT6 and iguidance 4 on my mogul and although neither is perfect, i find iguidance 4 a bit more pleasing on the eye and slightly better usability-wise.
For POI I prefer googlemaps over TT 6 or IGuidance because the database is better supported in terms of updates. Once i get to where i need to go, i fire up googlemaps and start searching for restaurants, shopping, etc. I always find the results to be more comprehensive.
I'm using a Holux m1200 BT GPS receiver. It's small and battery life is great - best thing is it's user-replaceable as it uses a standard nokia Li-On cell phone battery.
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