What options could a non-magical character possibly have that compare with that thought? Make your martials supernatural at a certain point, however, and you're golden.
Important to remember that the classes don't have to be balanced through equality; they can be balanced through equity instead. Ie, you don't need abilities to be of comparable capability as long as they are comparable worth, and theres plenty one can do to fulfill that.
Course, my own opinion is that trying to balance classes against each other is a waste of time and energy that ultimately just results in clawing back what certain characters should be capable of.
The game can be balanced in other ways that open up class design to no longer be so conservative.