My black 2000 finally arrived today. I've played around with it for the past hour, here are some brief initial impressions.
First, it feels fantastic. The rubberised grip on the back of the unit makes holding it very comfortable, and the button placement is great. The 1000 feels clunky in comparison. The L/R triggers are noticeably improved, and the face buttons feel a bit more clicky. The dpad feels a tad bit looser than the 1000, overall they are extremely close but right now if I had to choose which dpad I like better I'd go with the 1000. Overall the 2000 is the clear winner in comfort, and this is a big deal for me as I don't enjoy playing uncomfortable handhelds (such as the Vita 1000 and OG 3DS) for extended periods of time.
The screen looks far better in person than in any pictures or video posted online, which is why I am not going to bother posting pictures here. The colours are more subdued compared to the 1000's OLED, but it is a sharp, vibrant, high quality LCD with no ghosting or other noticeable flaws. Great viewing angles too, and no perceptible input lag. Side by side, the main difference I notice between the 1000's screen and the 2000's screen is the 1000 is brighter, with colours that feel oversaturated with a bit too much contrast. The 2000, on the other hand, sometimes feels like the colours are a bit too subdued. Something in between the two screens would be ideal, but this is really just being nitpicky. They are both great screens in their own ways. In fact, I have found PSP games look better on the 2000's screen, perhaps because the OLED exposes more of the artifacts/problems with the original graphics?
One thing that really stood out in my comparison was the difference in speaker quality. The 2000 model is so improved in this regard, it blew me away. The speakers are placed better so your thumbs do not block them (a problem on the 1000), but that is not all: the volume is nearly doubled, and the clarity of sound has been improved tremendously. Richer bass, clearer high tones, etc. I always had to use headphones on my 1000 because the speakers were such garbage, but not anymore with my 2000.
The feel in the hands, the thinness, the light weight, the microUSB charging, the extra hour of battery life, and the vastly superior audio quality make the 2000 model the clearly superior one for me. The screen is still wonderful, it's just not OLED. It's on par with the ipad Mini screen, for example. If you can deal with that, you'll love this. If all you care about is an OLED screen, you'll want to stick with your 1000. That's pretty much all it comes down to in the end.