Upgrading a system like this is a complex undertaking. As has been stated, your system is balanced, components all basically on the same level. I don't see any of the suggestions offered up as being wrong, just a matter of philosophy. I would like to serve up another for consideration. In my opinion, your next upgrade should set the table for what it is you want your system to eventually become. I feel it should be a significant step up from what you currently have. Make it as long term an upgrade as possible. I always think the weakest link should be upgraded, one which can make the most overall improvement. I would upgrade your preamp. I would spend as much as you have in your budget to buy the best preamp you like. One that really takes you up at least two levels. Some suggestions(depending on your tastes and budget) would be Air Tight, Audible Illusions, Audio Research, Blue Circle(really love these), Cary, Electrocompaniet, Jadis, Mark Levinson, Musical Fidelity, Rogue, YBA, etc. The other components in your system will not hung out to dry with this strategy. In the future you may want to upgrade the weakest link to the same level as the new preamp you choose. Good luck!
