McIntosh Vintage C22 Telefunken 12AX7 or ECC803's?

Are you referring to the ultra expensive NOS Telefunken 803S and not the reissues that are 803S in name only?

The true, old Telefunken 803S is, at least in my phonostage (Viva Fono) and extremely clear, detailed, dynamic, and extended range tube. It is NOT for someone looking for warm and lush. In that sense, it is like old Telefunken 12AX7, though I would say it is more dynamic and a touch more lean sounding. In my application, it is dead quiet, but, then too, the Telefunken 12AX7s that I had were also pretty quiet. The 803S has a reputation for being extremely robust and having a really long life, though I don't know if the McIntosh is hard or easy on tubes. If it is rough on tubes, I would say stay away because 803S are now VERY expensive.

Many consider Telefunken ECC83/12AX7s to be on the bright or lean side. If you consider them to be lush enough for you (I do as well), then you certainly ARE a candidate for appreciating the ECC803S. These have a similar tonal balance, but also, greater clarity and a bit more explosive dynamics.

You possibly could rationalize such an expense by the reputation of that tube outliving its owner.

I am a fan of Amperex BugleBoys where a warmer tube is desired. These are great sounding and pretty long lasting tubes.

It sounds like you will have a really nice setup.