The most important decision?

Stick with what you have! If you don't know your keyboard inside out, if you've ever heard a factory demo that made you go WOW! (of your arranger), if SOME of your stuff makes you happy and some doesn't... It isn't the keyboard.

Familiarity, knowing the sounds, effects and OS like the back of your hand will go a LOT further than getting the latest, greatest, but only scratching the surface of what it can do. Dig deep, explore the WHY of why some things sound great and others don't, get to know your OS as well as you know the keys (or even better!).

You take ANY of the mid to upper level arrangers out there right now, and spend four or five YEARS on them learning them inside and out, I guarantee you'll blow anyone away with the 'latest greatest' that they've had for only a few months, no matter WHAT new features they have.

Just about ANY arranger in the $1500 and up range (S900, PA800, E60, etc.) can sound absolutely amazing. Those factory demos aren't made on Oasys's or FantomX8's. They are made on the very keyboard you own! If YOUR work doesn't equal theirs, it certainly isn't the arranger...

We really need to try to think less in terms of a technology fix, and concentrate more on an 'understanding' fix... Deep and intimate knowledge of the full capabilities of what you already own will go a lot further than a cursory knowledge of the NEXT arranger...

JMO, yada yada yada....