TStubb, I am in the process of building my first HT subs and from my research the old inuke1000dsp or new nx1000d are very highly recommended. Good power, budget friendly and there are tons of posts here to help tweak the settings. It should rock your dual PA460s!
Also, I read the rx-a1060 doesn't calibrate below 31hz with the stock ypao mic so you have to get an aftermarket one? I am new to HT so I am not even sure that its required when your sub amp already has dsp built in?
Hope that helps?