I think Classe and Mac are good choices for 805's but I chose Pass.
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Like Mlawitm, I think Classe and McIntosh are good choices with B&W. In my case, however, I chose the MC275 for my 804s. I thought tubes worked really nicely with the aluminum tweeter in the 804s (which is the same as in the 805s). With diamond tweeters I might prefer solid state.
If at all possible, try and listen to both.
You will get better sound with the 252. I've had B&W N804's, 803's, 802's and Signature 805's. They sound BEST with Mark Levinson. But your Mac's will sound great. I have had at times in my system Mac 402's and 501's. At my dealer friends the 252's on the new 804S B&W's sounds awesome!! Just my 2 cents....