Hello jrudnitz,
Welcome to the forum.
I can only really comment on the EM2000 as I used to own this board. It has excellent sounds and the styles are to Rolands usual high standard. It has a built in zip drive as well as floppy drive which is immensly useful. It had a cool feature where you could play the first few notes of a melody and it would search its database of midi files to find the song/sequence. Much faster than manually searching through hundreds of midi files to find the one you want. Some of the accoustic piano styles were excellent. I really missed these when I sold the board. The only thing that I found intimidating about the EM2000 was the operating system. This was probably my fault as I had never used Roland before and found it a little more difficult to access what I wanted quickly. Also there is no mic input on the EM. All in all it was an excellent board and I still miss many things about it. You could do a lot worse for your first keyboard. There are people here whose expertese re this board far exceeds mine. Graham UK for one knows this board inside out.

I have played the PSR 2000 and was VERY impressed with it. There are pro musicians who gig with this board and are very happy with it. Scott Yee and Don M (to name but two) both use this keyboard professionally. This is a relatively new board (compared to the EM2000 and The Casio) so there are bound to be more advanced or newer features on it than with the others. Apparantly by all accounts the harmoniser and mic effects on the PSR2000 are really very good. I would not worry too much about customer service (from a technical aspect at any rate) as there are lots of resources on the web especially for Yamaha. Indeed here at Synthzone you will find any number of people happy to help you both before and after you buy (whatever board you decide on).

I remember that when the Casio first came out a few people were quite surprised and it was percieved to be much better than earlier offerings. I really cannot comment here as I have never owned a casio but if reputation is anything to go by then I would make my choice from one of the two boards above and leave the casio alone. (Sorry MZ owners )
Hope that this helps
Tony