Are you interested in a Garminfone? No? Well neither are many other people. That's probably why T-Mo just slashed the cost down to $129.99 (Tmo News). The Garminfone comes with the Garmin Navigation experience fully integrated. It has a 3.5" screen and would have been a far more impressive product if Google Navigate didn't exist.
If you do need a badass GPS device coupled with a decent (if minimal) Android smartphone, you could do a lot worse than the Garminfone. Check out TMo's website to buy one of your very own.