Marcus,
I think while the imaging is excellent on the ohm speakers, you will never get the same precision you'll find in a traditional dynamic speaker. Likewise, while you can find great imaging in a dynamic speaker, you'll never find the same openness and wide sweet spot the Ohms give you in a traditional speaker. Every design has trade-offs and as you've said the room is key. Like you also said it would be great to have more than one speaker to listen to! I plan on adding another setup with a traditional speaker but I don't see myself getting rid of the Ohms to do this. Enjoy the RS6's! I've heard good things about them :)