Sony MDR7506
I do not own these but I have spent time listening...and are what I currently recommend for $100.
http://www.amazon.com/Sony-MDR7506-Prof ... +headphone
or if you don't like Amazon:
http://www.sweetwater.com/store/detail/MDR7506/
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Sony MDR-V6
http://www.amazon.com/Sony-MDR-V6-Monit ... rds=MDR-V6
There is the nearly identical, non "pro" version ( MDR-V6 ). Best explained in the comments of the top review on Amazon for the Sony MDR-7506 :
The Sony MDR-7506 and MDR-V6 are IDENTICAL headphones, with the following differences:
1. PRICE: The MDR-7506 is, depending on where you buy it, about $20 dollars MORE than the MDR-V6 (comparing the lowest current street prices I found, $84 vs $65, MSRP is $130 vs. $109.99).
2. WARRANTY: They both have a 1 year parts and 90 days labor manufacturer warranty from Sony, but since the MDR-7506 warranty is handled by Sony's professional product division, some report a better customer service experience. The MDR-V6 warranty is handled by the regular Sony consumer products division. (My MDR-V6 has lasted about 20 years without any problem, as others in these reviews have reported, so unless you have a problem right out of the box, in which case you should get a new replacement directly from the seller, you likely will never make use of Sony's warranty, IMO).
3. PARTS (aesthetic only): If you look at the Sony parts/repair list, you will see that ALL parts for the MDR-7506 and MDR-V6 are identical except for:
a) the aluminum earcups (because they have the different respective model number stamped into them), and
b) the connector and unimatch plug adapter (because they are gold plated on the MDR-7506 and nickel plated on the MDR-V6), and
c) the sticker that is factory applied to the earcups (blue with "Professional" on the 7506, red with "Digital" on the V6).
So, the 2 models really are virtually identical with a 30% price increase. I'd personally much rather buy the MDR-V6 and spend the extra $20 on something tangible! Awesome headphones, either way.