I've played the EM-55 in a music store a few months ago.
But I was very dissapointed.
I have never played or heard the G-1000.
Even though you are a "Roland fan", I would
seriously consider a Yamaha PSR-1000/2000, or a Ketron XD9.
If you just want to have better sounds, you could check the Roland XV-2020, or XV-5050 out.
I think they sound awesome, and they are GM too so you can connect them to your keyboard and use the sounds of the XV.
you can go to www.rolandus.com or www.rolandmusik.de to listen to some demos.

Greetz,
Marcel