You should be congratulated for having put together a nicely balanced system. To really take it to the next level would involved a complete change out of components and the expenditure of fairly large sums of money. If you are serious it might help for you to explain what your system doesn't do now that you think it will do when taken to the next level? If there's something specific, then tell us. It's very easy (and somewhat dangerous/frustrating) to just change components and change the sound of your system. In order to cost effectively take it to the next level requires that you to have a specific goal in mind.
Which is more important?
I would like to take my system to the next level. What ever that may be. It is my understanding that any component can influence the sound as much as any other. Being economicaly challenged, upgrades are few and far between. Therefore my experience with new equipment in my system is limited. Plus, being in the military my listening room is always changing. Reviews are no help as preamps, cables, IC, and everything else seem to take a back seat to amps and speakers. Without rebuilding a house that belongs to the U.S. tax payers. Louis