I don't know where you live, but if it's possible, I would build a relationship with a good audio dealer who can demonstrate the possibilites for you. I know it can be a little intimidating, but otherwise, you're just stabbing around in the dark. People who post here are well-meaning, but just because something pleases their taste has no bearing on whether it will make your system more enjoyable.
If a dealer is absolutely out of the question due to geography, you're just going to have to go through a process of upgrading each component at a reasonable used cost, and then selling it if it doesn't work out. Not the best way to go IMO. Good luck.