But I'd rather mix with headphones because the constant replaying - looping - etc I know is getting my wife annoyed.
Things to consider:
"Constant replaying, looping" etc. sounds like mostly editing. Much of this can be done equally as well on closed back and often, inexpensive headphones. Or even ear buds sometimes. Etc.
Plus they are very much more desirable for recording/monitoring purposes. (Porpoises not so much, they keep sliding off their heads)
And while good open backs are superior to closed backs for truly critical listening when mixing, be aware that unlike closed backs, anyone around you can often hear them pretty well too. And I dont know about the previously mentioned semi's, but generally studio grade open backs arent that inexpensive either.
Maybe you can talk your wife into wearing the closed backs while you work with the opens......
Yeah, me neither.