This may shock a few people but I'm saying it anyway.....
I get the chance to hear a lot of stuff on a daily basis. Some of it is crazy expensive and some very affordable. I can say with 100% certainty that the results gained from crazy expensive to affordable is not as earth shattering as some in the audio industry would have people believe. If you take the time to match components, a mid-fi system (I hate that term) can get real close to a crazy expensive system and will please 95% of the people out there.
My HT system is currently made up entirely of Epos speakers and NAD electronics and when I decide to sit and listen to a song or two, it sounds darn good and everybody who has heard it to date has walked out saying the same thing. Is it high end or crazy expensive?.....not even close.
In another room I have a two channel system that has an absolutely stupid retail price attached to it (Gamut L7's, McCormack 750's, PS Audio Perfectwave DAC & Transport, Equi=Tech 5RQ) and although it sounds dam good, I could easily live with the sound coming out of the HT system. The HT system at full retail is worth chump change. The two channel system at full retail is over $40K and when you factor in cables, cords, room treatments etc, it's fast approaching $45K.
I have another system here that is made up of a Primaluna Integrated, Sonos ZP90 being fed into a pair of PSB Imagine T's and in all honestly, I would put this system up against systems that cost two and three times as much. It's simple, works well and is anything but expensive.
My point.....I gave up on trying to get the last 5 or 10% out of a system as I think it's a case of a cat chasing it's tail. It's fun as hell to watch but after awhile you realize that the cat is going nowhere fast and once you get to that point, you start to realize just how stupid the cat looks.
How many of you have had a system you were happy with only to sell something from it and then wish you had never done it? I would bet that almost every one of us has done it.
I agree 110% with what Bob said.
I think that if you are enjoying the music in your system then you have reached perfection.