nagra plp find a good power amp

any good suggestion
(pass labs 250.5/goldmund toles 150 .....etc
the last choice nagra pma
i play nagra vpa before
now i use vivid 1.5
ML 431 was very nice , i wanted to try krell for a change , the ML s are a bit " darker " sounding very nice a plp /ML 436 would also be a very nice combo in my opinion