Wow, I thought we were looking at cheaper alternatives, lol. I would avoid the Adcom. I had an Adcom GFA-545. It was on the warm/slow side and sounded dirty/smeared when compared to other better amps.
The Emotiva XPA-2 is definitely a contender if you are considering this and definitely better than the XPA-100 monoblocks. Very strong amp.
I do not have any direct experience with the Wyred 4 Sound (or any other ICE based Class D amp). Eric Squires likes the w4s, but I cannot give you an opinion on how well it will control the woofer. It does have a radical 100k ohms input impedance!