Am i missing something without a power conditioner?

Quick answer... YES!  First, congrats for using good A/C cords.  Too many skeptics don't know what they're missing.  But a good power conditioner will still lower the noise-floor, revealing more detail and ambient information.

I am a big Shunyata fan, because I've found that their conditioners 'do no harm' (i.e. do not restrict dynamics or affect tonality/timbre in any way).  I use their Guardian conditioner, and still remember the dramatic improvement it made to my (already quite refined) system.

If you have the bucks, I'd suggest the Shunyata Denali or the new Audioquest Niagra (as I've heard some raves about it from reliable listeners).

@tattooedtrackman - I have my power amp going directly into the wall too.  Shunyata claims that their conditioners will not restrict power, but I've found that many amps sound better 'straight into the wall' than they do connected to a variety of A/C conditioners.

However... the Shunyata folks tell me that thee is a 'proximity effect' so that an amp plugged into the same duplex as their conditioner will also get cleaner power.  True?  I honestly don't know.  Happy Listening!

@billshenefelt - Good A/C cords protect your components from noise being generated by the other components in your system (and PCs, refrigerators, etc.) moreso than that coming into your house.  It's not the 'last 3 feet'.  It's the FIRST 3 feet. I understand your skepticism.  Just audition a high-end A/C cord, say on your CDP, and listen.  You won't care WHY it sounds so much better.

@ieales - If you meant me, I'm writing directly to the poster, giving him my best input on his question.  I don't care about your argument w/ @uberwaltz about cassettes.  Cassettes??