Got the Garmin Nuvi 1390LMT (Amazon Link) from RadioShack (938 Market Street, San Francisco). Is hard to find electronics store around San Francisco and RadioShack is the nearest to my hotel (Chancellor Hotel!
The guy who attended to me was super helpful (I think in US, the service is generally good) and he recommended me the Garmin Nuvi 1390LMT as it comes with Lifetime Map Updates and Lifetime Traffic.
It boost a 4.3″ screen and has microSD expansion (for maps) as well as Bluetooth support for hands-free calling capability.
I paid US$129.99 (S$168.28) and after tax is US$141.04 (S$182.59).
I have been using it to navigate to Google HQ, Apple Company Store, Monterey Bay Aquarium and Ventura Beach and it is serving me very well!
Garmin Nuvi 1390LMT