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Blending to planars/ribbons/horns all dictate a matching farfield acoustic sensitivity and ~flat phase/transient perfect response in the passband (this includes the XO's overlapping BW also), ergo you ideally need a bigger version of what you've already got and high order active L-R XOs. Once you move away from the ideal you have to decide where you're willing to compromise. Most folks who want to keep the mismatch to a minimum just ditch the phase response, limiting its match to the XO point (time aligned/phase aligned).
This leaves us with a wide BW Q = 0.5 sealed, or open baffle (dipole) with a true 1st order or 4th/8th active L-R XOs. In this BW, of these two, the open baffle/active is the better choice, but is larger/more expensive.
I prefer prosound drivers which I assume would be much bigger/more expensive than you're willing to tolerate so others will have to chime in with any potentially suitable consumer grade midbass drivers.
GM
Loud Is Beautiful, If It's Clean
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