Hi John. In addition to the obvious sound improvements, The Tyros' solid key build & responsive key feel provides me the ability for far more expressive (musical) playing. Other Tyros pluses include: Hard Drive support for quicker song access & loading, as well as a huge storage capacity, it's LARGE color LCD screen and lighted arranger buttons make for easier 'on the fly' performance navigation, twice the USER ROM means more user styles can be linked to the MusicFinder, and 3 vs 2 footswitch assignments, a necessity for me as I gotta have: sustain, vocalizer on/off, as well as a 'fill to self' pedal.
Is it worth the price difference? Only you can decide.
I own BOTH the PSR2000 and Tyros. Though both are great keyboards, which one do I play exclusively now? . . . the Tyros of course! - Scott