looking through them both, i personally would choose the kappa pro,
1. it has a copper VC vs the aluminum which will be better applicable for midbass.
2. its a 3" coil vs a 2.5" vc.
3. the fs is much lower, allowing you to get even more bass for your buck.
another good alternative to look into for midbass are these
DIYCable.com : Intro » Home » Exodus Anarchy »
supposedly some of the best on the market if you have room for them.
`"* Toyota Celica *"`
Eclipse Avn 2210p
Diamond audio Hex S600s
U.S. Acoustics USX-600f
Fi rebuilt RE XXX 15 '05 (For sale pm me)