i fear there is no decent BKP, just GREAT BKP... ;)
i'd say a Holy Diver or Cold Sweat if you want beautiful cleans (and in this department HD wins by measure) and want to keep the warm and slightly scooped character of the PAFy '59, with no trace of mud anywhere... but of course you could find a more direct replacement in the vintage section... mule? i can't be of much help in this case because i've got just modern sets! what kind of music/tone are you after?