Differences in electric outlets

FIM is First Impression Music
see attached site
http://www.fimpression.com/SearchResult.aspx?CategoryID=3
they also have great CD's, K2, XRCD's etc...
hope this helps

Another question if I may, I see that some of these are cryo'd and others not- any real audible benefits from cryo-ing outlets?

Putting in an Oyaide R1 and 04 (I think these are the #'s) In place of a standard socket and Hubbel male made a huge improvement.

No doubt there are quality and mechanical differences between receptacles.

Whether those differences result in an audible change is an entirely different matter.

Personally, I'd skip the hospital grade and other high-dollar stuff and get good quality commercial grade receptacles. Put the savings towards something that makes an undisputable improvement such as acoustical treatments for the room.

Buy a good quality commercial out let and take the extra $$$ and have an electrician added a dedicated 12 gauge wire / 20 amp circuit from your electrical panel to your listening room. Make sure it goes to the panel and not tapped into another circuit. Now THAT will make a difference.