Agreed with @jg2077, Dunlavys are easy to drive and relatively sensitive, so they'll sound good with 30W on up.
My III.As are driven by Rogue M-150s, and it's a great combination. I sold my Aragon 4004 Mk II and moved to the Rogues to enjoy the midrange lushness, as the Dunlavys don't need help revealing the upper registers.
My first audition of the IVs (non-As) was with an Exposure integrated, in fact. I don't think the output power was much higher than the low teens in watts. So even at those low power levels (AB bias, even) - that was the configuration that hooked me into seeking the setup I have now. I'd expect Class A (like jg2077's setup) would sound sublime.