Actually the 2000 screens are better afaik. The 3000 screens introduced a way of expanding the colour depth however the 3000 had another feature which basically made interlacing very noticeable, any fast motion caused horizontal lines to become visible. I have seen the difference in person and there are photographs that show it as well the PSP3000 is a no go for me.
PSP1000 blurs with motion as does the PSP2000 to a lesser extent the PSP3000 has annoying noticable scan lines through the whole screen.