indeed. If you think its worth it to do something to make it sound better now that you've got a glimpse of the greatness that lies within, you do indeed have some audiophile tendencies stirring :)
I am starting to think that speaker position and possibly the fact that all of this stuff had been unused for a few years are all part of the problem.
When I first assessed the system I had the speakers in the middle of the floor a few feet apart. My wife thought the bass sounded fine but it seemed 'thin' to me. Once I got them positioned more reasonably, let the system warm up and played them for a while they did sound a lot better. And again, I'm not an audiophile and I may just be used to stuff with too much bass.
With the bass turned up a little on the Onkyo home theater system everything sounded awesome. I sat and listened to several albums of different types. When I went back to my Bose bookshelf speakers with an old 25 watt Toshiba receiver they sounded pretty bad in comparison whereas they sounded fine before I got this high end stuff.
If you want a little tip from someone that's been at it a long time: have fun. That's it- just have fun with it and don't get obsessive. If you find that you like what you hear, there is a whole world out there of stuff you can get and things you can do that will continue to make improvements... just keep the fun part in mind, and enjoy the music.