A genuine "player" could be happy with any top model arranger from the last ten years..
The newest styles (any style can be used on the same 10 year old keyboard) are not the best reason to keep buying the current model..
As for sounds..a ten year old board has great pianos including EP, it has great bass, drums are mostly good, sax and guitar are very usable, organ and brass rival the new stuff...the most important ingredient is the "player"..

The guys buying something every six months are the "biggest losers"..The gain is next to nothing and it is interferring with you learning to use the instrument...most never even get to know what the instrument is about..

Sometimes we think it makes our performing life easier...but when you consider how well you could know your 10 year instrument...does it?
Very few folks here can tell you how to use your instrument in detail...maybe a punch in to sequence (change) a bass line in a variation style etc..

The more time we spend understanding and making use, of our instruments...the better player we can become....

Personally, I have no doubt I could be a contented player if I never changed from my G1000, or a decade earlier keyboard to the G1000 in that era..A 10 year old interval is not night and day difference...except for the gimmicks..

If you are waiting for the next version of what you own...you already have the wrong keyboard..in your hands...learn what you have!!!

PS: I understand the need for new toys, but keep it in perspective..especially if you want to be efficient on the keyboard..