If you did 8's I have a pair 85 shipped Morel mids that are only 2.75" deep and can handle power, also reach high enough to do a 2way. Pm if interested. Ignore if not.
My ID OEMs have very nice midbass. I'm running them without any high pass filter and they never bottom out with ~100 watts going to them. A pair in each door would be very nice...affordable too.