Beyer Dynamic DT 990s without doubt. They are the the greatest most comfortable, clearest, most well made headphones available. (imo) There not cheap but there are not super expensive. Open back so they are good to let the bass guitar sound good. I dont like the closed backed 770's. For bass they are too compressed and hold in too much sound personally. You can buy replacement ear pads if they get worn out too ...
Abyss Audio do a pair called the Diana TC and they are £4700. Supposed to be incredible but you may want high end seperates for those bad boys. HIFIMan do a pair for nearly £6000.
Stick with Beyers they will last you life time.