It would be hard to say what is the best TFT out at the moment, also even if some one could say what was the best most likly the next day or so there could be a better one out, the only way would be to look at review and try and make this choice your self.
I would also say that there isnt a big difference to the TFT these days and you would have to be very clever to be able to see a speed difference etc etc within the screen image.
Hope this helps