Another Caso 350 user here. Not a lot of heavy use but I didn't know if it was me or were the keys getting noisey. Still a great board for the price with lots of features. I was ready to got for the newer 360 with the touch screen and then I thought, "will I use all the extras on that 360 or do I just want a killer piano"
So I went for the Roland FP90 and its fantastic. I start playing and don't want to stop. I have it hooked up to my studio PA but lately I have just been using the onboard speakers which are more than enough. Out of the box it was good but after making a few minor adjustments in the Piano Designer section it really came alive.
The Roland 2000 uses the same keyed and Piano synthesis but gives you a bunch of live preformance options. The Kawai ES8 is also a contender but I couldn't find any serious discounts on one and I didn't need all the preformance options it had like the Roland 2000.
If you can play an FP90 do it and I'm sure you'll find the extra cost will be worth it.