In reply to:

...what is the upper limit of what you'd spend on a single pair of speakers for a two channel system?




This needs some clarification here.

Is the question asking what you would spend if you had the finances of the King of Saudi Arabia or based on what you earn now or when you are retired or if your distant relative died and left you a huge inheritance, or if you did not have a wife, etc. etc. etc.?

The only time I ever spent a lot of cash on a pair of speakers was when I was single. Though my wife says she would let me spend that kind of money now if we had it, but I don't believe her for a second .