C-2 C-60 or C-80 : which to use for the best sound ?

I'm currently using a Yamaha C-2 with a pair of P2200 amps to bi amp the JBL XPL200's ?
Sounds great...but as a certified "audiophool" I'm always looking for improvement.
Would the C-60 or C-80 preamp's offer better sound quality in this particular application.
The C-2 is an excellent sounding preamp imho but having recently used a Denon AVR 7.1 as a pre I'm wondering if the C-60 or C-80 would sound better.
( the denon btw has excellent sounding pre and tuner sections but my system is vintage so....well....you know the story.)

If you happen to hear any differences, it would be a matter of preference.

C-80/85 of the pre's your refering to.