Could use some amp suggestions

You woulddn't be doing your Infinity's or yourself any favours with an Adcom amp.Test drive a Bryston,BAT,Cary,Audio Research.

I would go for Class D amplification in this case if you want multichannel. You can get excellent results with those Kappas. The D amps can put out tremendous power, in a small footprint and can easily accommodate 5 channels. Wyred4Sound makes excellent amps for the money. Powerfull also. PSAudio would be another choice.

Tough speaker if I remenber right;maybe Odyssey,Belles,Jeff
Rowland and Classe in addition to the several excellant solid state already mentioned.What is the Budget?

Doing a bit of Googling for the Kappa 8.1 specs I found a list which indicates a 6 ohm imp, 89db speaker system which can handle UP TO 300wpc.

I doubt very seriously you need 300wpc to adequately drive these units from what I read.

Rating a speaker at a max power handling of 300wpc isn't a remarkably high rating. As a 4 way speaker with 6 ohm nominal impedance rating, finding a good brand amp with 100 - 200 wpc into 8 ohms should prove sufficient power in real world terms.

The butler TDB 5150 will drive them. An Odyssey stratos plus will too, so will all the other amps listed here... as all of these produce real watts.

The question thereafter for yourself is not so much then "how many watts" but "which watts"?

If you don't have a balanced preamp, don't waste your time/money buying a balanced amp.
I personally think 2 Adcom 5500s would be fine driving these.
If I remember correctly, some of these Kappa speakers had a difficult to drive crossover scheme, that can be modified to make them easier to drive.
Adcom 5500s can be bought here regularly for under $500.00
each. Try to find later production with IEC power cords,
then you can tweak the sound easily...