bagwell359
Headphoneus Supremus
I just got a refurbished pair of 1970s AKG K240 Sextetts, late production version. They cost me all of $68 on eBay. Not recommended for the OP, they are 600 ohms, but they are pretty amazing for the price. Insanely good for metal music. They make a great 3rd or 5th headphone if you have a good amp to drive them. Vali 2 will actually do a good job.
My first decent headphone was a circa 1978 AKG K-240. It finally died in 2014. I used it a lot when I had a tone arm that had adjustable VTA - FR-66. But when I went with a Clearaudio straight tracker in the mid 90's they got put away. I bought a used Stax 303 Classic around '03 - much better, which I barely used because my speakers were legendary: ML CLS IIz (w/ Gradient 57 subs at times)and Verity Parsifals, stacked Pass X-150's, Pass P, Koetsu Signatures - yeah I was liiving large.
I disliked those 240's quite a bit. Very plasticky sounding, with a ridiculous over cooked treble - great for quick VTA adjustments, bad for listening. Mids OK outside of the plastic, bass good for the time.