I am looking for over-ear headphones for music up to 100 pounds.
Sound quality is the most important feature I care about.
Open or closed?
First over-ear I got was the DT770 pro 80 (around 160 new). Great bass that you can feel but the mids and details aren't the best. A lot of fun and reaaaally comfortable.
If you want to go used you could probably get some AKG K/Q 701/702s that have great soundstage and texture (just better overall sound except for bass) for that price.
The DT770 are closed and the AKG are open though.
I'm pretty new to this hobby too so just my 2 cents