Regarding the 2000 keys, I like the light touch. I'll bet Scott Yee and I put more "miles' on those keys than maybe anyone else in the world. So far they are holding up fine. It's only been about six months, but I use mine at least 4 hours every night, and sometimes have afternoon jobs to boot. I imagine that Scott, being more of a piano player than I am, plays it harder than I do, so maybe he can add something more.
We must bear in mind that the PSR2000 is in the $1000. range. The features it offers for that amount of money are really phenomenal.
DonM