Gryphon Diablo 120, Luxman L-590AXII, Other? For KEF R11

I recommend keeping separates rather than diving into mid tier integrateds. Perhaps get into a reference level amp like a used parasound JC5 and then get a preamp later on. I get the feeling that the equipment you are looking at would be more of lateral move than a step up.

this advice is misguided and incorrect in my opinion

both excellent

gryphon > luxman by a little

but both are a good bit above your r11's in relative quality level....