I'm way out of warranty range, but TomTom customer service was quick to offer a trade-in for one of the newer models. They offered a new One for $250, which is pretty reasonable. I'm kind of leaning towards the 910 for the text-to-speech and longer battery life, but still haven't decided.
That sounds like a good price. I can understand you wanting the 910 because it really is a significant upgrade from your GO classic.