yeah, they're all good.
I'd choose Floyd Mayweather and Marco Antonio Barrera, although the former's yet to really show his class and the latter is getting on a bit.
I do think that the best pfp fighters in the world are mainly around welterweight/middleweight these days, and also the featherweights, like Manny Pacquio and Erik Morales. Joe Calzaghe I was especially impressed with, he beat Jeff Lacey easily and showed his real class.