in my opinion: no. The Tyros keyboards are very good instruments as is the s910, but I would never spend that much money. Got my T2 for £ 1300 used a couple of months ago. Sure, the T4 has the choirs, etc, but it does what I need it to do and it still has a few excellent sounds, as well as great styles.

3K is a serious money investment, I'd rather make a business investment than buying a T4 , or an Audya, or whatever it is.

These are all good instruments but their price tag is exaggerated, compared to the sound quality nowadays offered by software like Band in a box, Eastwest, etc

The s910 is stilll a nice instrument. Maybe consider an used T2 too if you want the keys and the sampler