I'm very, very, very happy with my system with a few caveats: 1) I believe the front end power can be cleaner via conditioners, pc's, etc., 2) I'd like to spend more time on acoustic treatments, 3) I'd like to do more work on isolation / decoupling, and 4) I'd like to supplement my digital front end with a higher end single disc player that also does SACD. Technically, I'd be changing just about everything other than my existing components ;-) Does that count?
Honestly, I love my system and am finding it hard to go to bed at night since I don't want to stop listening to music. Nonetheless, there is so much more to music reproduction than the components themselves. I think there are two general areas of focus in the land of audiophiledom: the system itself and the system environment, which includes the first three factors I mentioned plus things like room layout and speaker placement. My focus now is on the system environment. If I keep improving that, I may never get any sleep ... but what the heck!