Heya,
Check out the Shure SRH940 if you want something closed, isolated, comfortable, with those qualities. Otherwise, the AD900 would be the logical choice for you for an open headphone. Even the A900X would be a nice move. Maybe also look at the Beyer DT880. Also look at the Fischer Audio FA-002.
Grado sound is Grado sound. Forward mids, very bright, lots of attack, making it great for guitar basically. But they're open and leak big time (both in & out). You probably wouldn't enjoy it on the sole quality of comfort, they're a challenge to enjoy wearing for very long and are on-ear with little sound staging.
Very best,