If your screen is still good on your EM2000[pixel problems]...I would keep using the EM2000..
You still would not have a mic input with the E-50...
You would gain make up tools on the E-50, but I think over all the EM2000 is the better board...Most of the sounds on the EM2000 are equal to the E-50..maybe a few are better on the E-50.

The EM2000 was a top of the line instrument..The E-50 is not..