Fs of 80hz means they won't be working well in the lower end of the range you want. My suggestion would be the Bravox EXS6. They'll play down into the mid 40's... Plenty for your midbass, and they'll take 200w no trouble, so plenty of room for amp expansion. Last time I checked they were like $50-60 each from C3.
Edit: Those Silver Flute's look nice...
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