i have a yamaha rxa-2060

I also have the following
adcom gfa-555
adcom gfa 545
rotel rb-956ax

would any of these amps be any good to use instead of the built in amps from the receiver or should I use the pre outs

my speakers are
fronts energy c-8 floorstanding
rears - paradigm reference studio 20 v2
surround - polk RTi4
klipsh synergy 12" powered sub