I own some vintage headphones, and i have 2 pair's of vintage sansui and 2 pioneers... all 8ohm.
and i want to say that this are most beautiful headphones on earth :
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120595184032
sorry for ebay link i dont want to copy photos from auction.
Best thing is that they also sounds nice, pioneer SE-50 sounds very crappy... SS-50 are probably best 8ohm 2way headphones ever made
. Their sound is very modern, when you start listening old headphones, you know that they are old becouse of thier specific sound... crapy bass, highs and mass of midrage, ss-50 are diferent, thier highs sounds fantastic, they have huge soundstage and very nice bas... I use Zero DAC and Yamaha CR-620 to drive them.
on ebay people want funny money for them, very nice position for everybody