I have a 2000 and played the 2100. There certainly wasn't anything there worth trading or selling the 2000 for. Sometimes we get caught up in wanting the latest. If that's where you're at, then go for it. But for my limited budget, I'd wait for the 3000.

BTW, I bought a Roland VR-760 to compliment my 2k. As an ex-Hammond player, the VR does everything I need. The drawbars are leaps ahead of the 2k virtual drawbars. The electric pianos are great too. The synth section is so versatile. I basically use the 2k for styles and a few sax/flute/string parts now. I think the 2k sounds are pretty much as good as they're gonna get (or need to get) except for one or two sample improvements - not worth the expense anymore.