Onkyo A-50 vs Buckeye Purifi 1ET6525SA

I know it's AB. The Pioneer/Onkyo sound signature has been about the same since the 1970s.

I'd prioritize power and look for sound signature elsewhere. If you can find both in the same amp without costing an arm and leg (ie McIntosh), great.

btw the off the shelf class D modules do not have remotes and have to be kept on all the time. They're not as elaborate as a real amp. ie They don't have resistors to slow discharge the capacitors so they make a moderately loud whine through the speakers when you power it off. Annoyingly cheap but not a deal breaker.

I think the Buckeyes have a 12v trigger. So hopefully they will automatically turn on and off with the WiiM. If not that's probably a deal breaker for me.

I don’t see a compelling reason for either one to drive such hard to drive speakers.

I am not a Class D fan so I would go with the Onkyo but for that price you have a lot of options (Quad, Mission, AVA, NAD, Primare, Belles, Vincent, used Simaudio, used Hegel, etc.) 

What would you recommend then? I don't want used but open to other new recommendations. Not familiar with some of those. 

@chanur Have you considered Schiit?  Lots of options you can build a system around when you are ready.  Also a great value.  As suggested by @parkergetdean you do need some serious power for those relatively inefficient speakers but I'm guessing you already know that.