@ Mr.Peabody.

Ok the cheapest working soloution is in my opinion a Parasound HCA2200 (500$) for the woofers. For the midrange and tweeter you can use a Sonic Frontiers Power 2 (1200$).
Then you need a gain controller to adjust the attenuation of the low frequency and high frequency ampliifers. ( FIRST WATT BUFFER B2 300$ if you email Nelson Pass)
As a preamp you can use a Prima Luna tube for 300$.

With the HCA220 you can drive the whole speaker too.

You do not need to buy all at once, but I would recommend this combination as a lower priced one. It doesn't make sense to buy a cheap Adcom that can't really drive those speakers and as I have talked with Arnie he still would recommend a tube amp for the midrange and tweeter becouse its sounds simply excellent on the Kappa 9's.

I hope this helps.