I've noticed it's pretty typical for the engineering and science guys I've gone to school with or worked with to marry nurses, physical therapists, religious educators, or HR gals. Think fem careers that are in demand wherever the two of you might live. And these marriages seem to last.
My definition is a bit different - my wife loves her career as a nurse and can see herself loving the field of reproductive health forever. As a result, she's pretty grounded and we balance each other out well.