I've found this one to be the best quality, it might be more expensive, but in terms of versatility of voltages that can be used, as well as the genral visual quality, I think it's the one to go for
I've honestly had no real problems with the 3.5" screens from DX/eBay. They usually are pretty clean images. Not to mention some even have touchscreen digitizers.
Thinking of that, I should probably get to seeing how well that works with the driverboard I have.