If you're looking for 12AT7's, these Footscray plant Brimars are pretty special. Actually, very special. I won't take credit for discovering them -- it was the guys over in the Schiit Mjolnir thread. I ordered a couple and have to agree with them (and I'm not even much of a Brimar fanboy).
Damn, just too late, I just ordered a 1960's or possibly 1970's Brimar. Watford valves rated them so I took the chance .
Brent Jessee said the later Brimars aren't that much different in sound so I'll have to take his word!
Edit: Was thinking of ordering the 12AT7 you linked to to compare to but my amp needs the higher gain 12AX7 really