Portable GPS navigation unit for car

I'm a big fan of Garmin's Nuvi Series for GPS. I find them quick to navigate and select things, fast to draw maps, and pretty good route calculation from point to point. Updates are put out yearly for a somewhat reasonable fee, but it includes a great POI database for all sorts of locations.

TomTom has other options, and while I don't have a lot of experience using them, I know many people who are happy with them.

Anyone else have a GPS system from another brand that they're liking?

I have and like the Delorme street Atlas USA. It is software and a bluetooth receiver that can be laid on the dash and you use your own laptop or PDA to receive the data and display it. It is not easy to learn, but it has many benefits for the person who wants more than a route to a destination. I like to have a moving map when I drive cross country in my RV. The maps are quickly scalable so you can see what is up ahead of you. Delorme has several other hardware/software combination.

 I am sorry, i don't like GPS, so i don't know what brand is best for this, I am a big fun for Charmaker car digital music changer, it is a revolutionary car mp3 player and delivers CD-quality sound directly into the factory sound system via the CD changer port, without the loss of sound quality that occurs with existing cassette and FM transmitter solutions. Directly connect to your car radio by a vehicle specific cable harness, and directly control from car stereo panel or steering wheel, user can enjoy the digital music (MP3/WMA) what you like in your car only need a SD card or USB disk, and there also is Aux input for external audio sources, Auxiliary devices such as MP3 players, Portable DVD players, Minidisk Player, handheld gaming systems, notebook computers and IPHONE can be added to the OEM radio while delivering optimum sound quality.