[sbddude]

I've used TomTom, iGuidance, and Garmin Mobile XT.

I liked the TTS capability of iGuidance, but the interface was way too hard to use and the fact that 1.2GB is required for maps is not good.

Garmin uses the same updated maps (Navteq), has traffic, good interface, and works perfectly with the Mogul's internal GPS without any hacks or workarounds.