Critical listening or a reason to keep tinkering?

Different parts of my system have evolved at different paces and have reached varying degrees of completeness in the sense that you are asking about. For example, over the past 20 years, I went from moderately inexpensive monitor speakers to moderately inexpensive floor standing full range speakers to high end expensive monitors paired with a high end sub to finally a pair of high end expensive floor standing full range speakers.  The loud speakers in my system are now where I want them to be, there is nothing missing, they leave me wanting for nothing more.  Audio happiness!  Ok sure, if I find myself with a winning lotto ticket, I may move up the line in the speaker I have now, but for all practical purposes (even audiophile purposes), there is no reason for me to change my speakers.  I feel that they have reached that sweet spot in my auditory expectations and their place on the diminishing returns price ladder.  I have a similar story and similar feeling with my power conditioner, power cables, phono cartridge, and amplifiers.  There are a few areas of the system where I feel less of this level of completeness.  My speaker and interconnect cables for example, have evolved, but still seem to be holding me back.  I feel the same about my tonearm and to a limited degree (compounded by its technological nature) my DAC.

My suggestion is to try to tap into this feeling of completeness, a philosophical appreciation of what your system does and doesn't do.  If you can get a handle on that, hopefully you will change a component when it needs changing and be satisfied with the components that do so much to bring that sonic smile to your lips. Good luck and enjoy the journey!

In the infinite, well, almost continuum of sound quality, no I'm not talking about measured performance but the *perceived* performance, how it sounds to you, there needs to be some method of figuring out where in the wide wide world of sports your system stacks up.  it's worth trying to find a system of high performance, one that is significantly higher performance than yours so you can contrast and compare your system.  Only then can you have something to shoot for. Otherwise you're just shooting blanks in the dark.  If it's any consolation, there is no standard for sound quality, perceived sound quality.  There are no limits except those you bring with you.

You said, "Thanks to all the information on this forum I think I am getting close to the unobtainable perfection in my listening world."
You are likely showing naivety in this matter due only to inexperience. The levels of improvement are endless, quite literally. There are dozens upon dozens of significant, powerful changes to systems, and they don't stop coming if one wishes to pursue them. Even when one has spent $100K on a rig there are many levels of sound improvement available. The escalator of sound quality reaches a goodly number of upper floors. 

One alternative is to pursue variety rather than chase "The One," as though there is a perfect rig out there. Even cheap alternative components with adjustments to the system can provide a relaxing variety which is tremendously gratifying. It allows changing things but not with severe escalating prices. As a System Builder I love this aspect of the hobby, and it is as valid as Mediaphiles who amass media. But, you can pick your "level" of expenditure to operate within. 

I strongly suggest you make a habit to have agreement with your wife on any changes. If she is uncomfortable with them, do not do them. The marriage is far more important than any system. You can find many pieces of gear to satisfy curiosity at all price points. But broken trust or losing love for unilateral decisions is far too expensive a price to pay for such things. If you keep to a certain price point you can still make changes which likely your wife will hear and appreciate (if she cares beyond protecting the budget or together time). 

Read a book while listening. Distract your analytical side. It works for me. When I do not wish to be critical, I relax and meld listening with other activity. 

Some people simply love to listen to music out of a very inexpensive small system while others get into the expensive system.
Sometimes as you are learning part of the hobby and fun is various types of upgrades and/or tweaks.
Stay within your budget and do lots of research before making a purchase.
Those posts above in this forum make a lot of sense.
Lastly check the internet in your local area for an Audiophile Annomus Group and if you find one please post the website for the rest of us ;-)!

OP-

what gear, including cables/cords, is in your system?