As for your other speaker, generally I've found that a simple first-order works best on something like that. First-order crossovers have such wide overlap that the choice of components isn't all that critical. You have about +/-2x window there. So I'd probably suggest something like a 1.0μF to 4.7μF capacitor with a shunt damping resistor of about 12Ω to 20Ω.