www.tomtomheaven.com brings you an homemade speech synthesis for all tomtom. For the moment, only one english voice…but, if there is some people interested in it…i can search to add new voices…

Sleek, ultra-slim design fits in a pocket; High-sensitivity GPS receiver for fast satellite lock
Pre-loaded with City Navigtor NT maps for North America, including more than 6-million name-searchable points of interest
Speech recognition–speak menu options and keep your eyes on the road
Multi-destination routing–enter several destinations and get the best route to all of them; “Where am I?” and “Where’s my car?” features
Full feature set–text to speech for spoken directions with real street names; MP3 player, and Photo viewer

Amazon.com Product DescriptionGarmin International’s nüvi 855 is a GPS navigator and personal travel assistant featuring voice-activated navigation and lane assist with junction view. Navigate with confidence while nüvi directs you to the preferred lane while driving. Also, see realistic images of upcoming junctions where available. Lane assist guides you to the correct lane for an approaching turn or exit, making unfamiliar intersections and exits easy to navigate. Click to enlarge Junction View gives you a photo-realistic screen that shows you both the road detail as well as the signs as you will see them on the road. Click to enlarge This advanced mode… More >>
Garmin nüvi 855 4.3-Inch Widescreen Portable GPS Navigator with Speech Recognition

If you’re looking for the right Magellan GPS text to speech vehicle GPS navigator, then you’re in luck! You’ve got several models to choose from in both Magellan’s Maestro and RoadMate series.
Actually, by far most of Magellan’s portable GPS navigators have test to speech, which means they say the name of the street you’re to turn on, instead of just saying, “Turn right, here.” Unlike Garmin, however, not all of Magellan’s devices have text to speech.
All but two of the vehicle GPS navigators in Garmin’s nuvi line have text to speech, whereas there are still a few navigators in Magellan’s two lines that don’t have text to speech. So, you’ll definitely want to make sure the actual model you buy comes with text to speech.
Magellan’s GPS’s are broken up into two lines, the Maestros and the RoadMates. Both are great devices and both have access to the Triple A Tour Book, if you’re a subscriber. (That’s a great proprietary feature that only Magellan offers.)
The Maestro line is further divided into the 4000 and the 3000 series. The only big difference between the two is the 4000 series have the larger, wide screens, whereas the 3000 models have the normal, 3.5-inch screen. Any model in the maestro line with a number greater than 4220 or 3220 will be a Magellan GPS text to speech device. The lower numbered models don’t all have text to speech.
Most of the RoadMates have text to speech.
Right now, you can get a Magellan GPS text to speech vehicle navigator for around $150.
Honestly, Garmin and TomTom both …