One other thing you might keep in mind: if you go with the 5's, you do have an upgrade path (though admittedly not a cheap one) to 5a status should funds and tastes dictate that in the future. If you go with the Quatros, you pretty much have them (not that that is a bad thing by any stretch) for the duration. At least that's the situation today -- Richard could always spin up a Quatro Series II someday.
Full disclosure: I have 5a's and love 'em.
Happy listening,
Dawgfish
Full disclosure: I have 5a's and love 'em.
Happy listening,
Dawgfish