I think they both are going to be very neutral and I cannot begin to imagine why you would need anymore power with those Klipsch speakers. I would suspect in an A/B comparison you nor I would notice any difference at all with any three of these you have mentioned. More power does not necessarily mean better sound, unless you were trying to push some difficult load with insufficient power... which you are far from doing.
I would suggest keeping what you have if you like the sound and spend the money on something else.
Unless of course you just want something new...
... then flip a coin.