While i do see room for improvement like any other system in existence, you don't mention any of the cables that you're using, size and acoustics of the room, type of music that you listen to or exactly what is wrong / what you're looking to improve. Throwing out a question as you did will result in quite a few "suggestions", all open to personal tastes and interpretation.
Instead of swapping components out one by one and playing the never ended "upgrade" game, try maxing out the components that you have. Doing this will keep more money in your pocket AND improve any equipment that you currently have or purchase in the future.
As such, i'm talking about taking the time to do the basics. Purchase a decent rack. There are quite a few threads and opinions as to what is decent, but i'll leave that up to you to do your homework. After all, "shopping & learning" is half the fun : ) Get the components set up properly on the rack in terms of various isolation, damping, absorption, etc... Carefully lay out your interconnects and power cords and speaker cables. Experiment with speaker placement, some simple room acoustic treatments, etc...
All of this will add up VERY quickly in terms of benefits to EVERY aspect of the system. The best part about doing "simple" things like this is that most of them can be done by yourself and for pennies on the dollar. Not only do you save TONS of money, but you learn quite a bit along the way.
I think that most people seek out performance by replacing / upgrading even though they never took the time to do the basics or find out what the gear that they already have is capable of. Once you've done everything that you can with the existing components in terms of "reasonable" and "sensible" expenditures in time and money, THEN evaluate the system. This will give you a better idea of what you think is lacking, what its' strong points are and where you need to go in terms of sonics. Doing the basics FIRST is kind of like studying a road map before taking a trip. Sure, you might still get sidetracked along the way, but at least you'll have a good idea of where you're at and what you need to do to get back on course. Sean
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