"OP" stands for Original Poster..."you" in this case.
It's always a bit of a dilemma when trying to decide just when exactly to take the plunge, always a bit nervous the next model will blow away the one we just bought.
Thankfully, Yamaha's carefully planned steps (some call them baby steps...how cute!) from one model to the next aren't so severe to make the last model suddenly out of date.
I have a Tyros4, and despite the great new features on the Tyros5, I don't feel the need to upgrade...maybe when the Tyros6 or Tyros7 rolls around.
Congrats on your choice...time will pass very slowly from now on...ha ha!
Ian I think you should wait till the T5 is released and demoed before you decide,....you might switch
........wait and see.