Whatever you do, do NOT buy a Navman S50.

My recommendations as follows:

Tom Tom Go 720.
Navman S90i.

Both have TTS technology.
But the Go 720 you can talk into.

If you don't want to part with the RRP or $699 for each, then I suggest a Tom TOm One or XL, perhaps even an S30.

Both Tom Tom and Navman have their advantages and disadvantages equally. Best way to find out is to play with one yourself and see which user interface you prefer.

Apparently Tom Tom have just released a new one again. Hopefully to replace the aging Tom Tom One XL, but I presume it will become the new range topper to replace the Go 910.

Happy to answer any questions, I sell this shit for a living day in day out.

Just.... don't buy the Navman S50.