With its outstanding 256-note piano sound polyphony, USB flash drive audio recording & playback system, new upgraded synthetic ivory & ebony keytops, and console grand piano lid sound projection for an even more natural organic sound, in my opinion it's worth moving up to the new PX850 over the PX830. If you cannot go up to the price of the new PX850, then I would still suggest you consider the newer PX750 over the discontinued PX830 if you're wanting to get an even more realistic acoustic piano playing experience at a lower price. Neither of the new pianos are available in polished ebony but they are available in satin black. But when you hear and play the new piano sound in these upgraded models, in my opinion that will more than make up for not having a polished ebony finish.
So before you buy a Casio PX830 (even at a discounted price), I would strongly suggest you consider the newer models which will not only sound and play substantially better, but also put you ahead of the technology curve too, and that's always a good thing.
If you want more info on these and other pianos and LOWER PRICES than internet discounts, please email me at firstname.lastname@example.org or call direct at 602-571-1864.