Which makes the bigger difference?

Thanks to everyone for thier thoughts, I pay ALOT of ATTENTION to vibration control and Room Tuning has made huge differences, as well as other small things such as great cables, cable elevators and PS Noise Harvesters. I've got a small room so little adjustments produce (sometimes) profound differences. Just wondering about my gear, I'd like to go to an ARC CD3 or maybe a Jeff Rowland Integrated (if I can muster the funds) but that's why I ask the question of impact and from what might the best logical choice if I were to make a change and if to go to seperates.

Sorry also failed to mention my interest in the Bryston CDP1 and the Sim Equnoix SE as a possibile match up as well

Agree with Krysgel, your question is about which change in electronics will get finer detail resolution, and isn't about changing speaker or room. Looking at your system as listed I think I would look at a CDP upgrade.