A possible upgrade for your McCormack DNA .5 is to try and score a used DNA .5 that has been upgraded by SMc Audio. Sometimes you can find them here on A'gon for about $900- $1000+. If not you can send it to SMc Audio for mods. Whenever I've spoken to Kris or Steve they always are willing to customize the mods to your needs and give you the most for your buck. To me if you are happy with the McCormack just stay along those lines.
Matching up speakers and amps
I currently own a pair of Spendor A5's that I am very happy with. They are matched up to a McCormack DNA 0.5 and the Acurus LS11. I am looking to replace one or both and also still debating tubes vs SS. Any opinions as to the Spendors matching up better one way or the other?