I think the Eminence Delta 10 sounds very nice in the seven π midhorn. You might try it and see how you like it. The price is right.You may know that I tend to favor JBL Profesional Series woofers. The addition of a shorting ring and the build quality of the JBL 22xx woofers is much better than comparable Eminence woofers, in my opinion. But not so much with the mids. Especially since the driver is horn loaded, which reduces excursion and low-passes the overtones, tending to attenuate harmonics.
My suggestion: Go with a JBL 2226 in the Profesional Series seven π bass bin. Use the Delta 10 in the midhorn. Pick your favorite compression driver and you're set.