Garmin or TomTom

I've owned Garmin GPS units for 7 or 8 years starting with the Street Pilot III. I would never hesitate to recommend them. Their tech support is fantastic. I liked their products so much that I bought their stock 2 years ago. It's more than doubled since then. Garmin Rocks!

Look at the NUVI 350 or 360 - very solid units. I think both have text to speech. The 360 has bluetooth phone support, and the 350 doesn't. The decision depends on whether you Prius has Bluetooth or not.