It doesnt make sense to upgrade any arranger keyboard unless it has features on it that dont already exist on the instrument you are currently playing or it handles those features substantially better. Yamaha are going to have to do much better to get the same kind of vibe that the T2 created. Now if the T3 had a true sequencer , true sampler, and onboard editing mixing facilities even with its existing sound arsenal it would have a world beater instrument. 76 keys or not !