The older series Grado headphones are more mid forward than the newer. You would probably enjoy a series without a letter in front of the model number, or if you don't want to go that old, the (i) series Grado headphones are more mid forward as well. As far as "over ear" you'd need to go with a model like the GS or the PS (not including the PS500) which come stock with the G cushions which are over ear. I own the 325is (only model with both, i & s) and I find them mid forward and to have that raw, live in your face Grado sound which I enjoy very much.
EDIT:
Also, any model Grado will accept S, L, F, which are on ear, or G cushions, which are over ear, but you may find there are pros & cons to changing cushions, especially if you go with the G cushions on certain models. This is all a matter of preference, though.
Grado G cushions are over ear unless you have elephant ears.