Can't choose for you, but I do own a '64 CDR and also a Champ clone (the later I'm sure still isn't close to the sound of a proper '57 Custom deluxe). I absolutely love the clean tones of the '64 and I've used it for a few gigs now and many rehearsals. I never seem to be able to get it much over 4 on the CDR even playing with an acoustic drummer, so I don't get close to using up it's headroom. For dirt I use an Xotic SL drive which sounds close enough in a band situation for the Marshall dirt sound when I want it, but I don't tend to use any other pedals with it. The Champ clone is a completely different device and getting natural overdrive from it is much easier (as I would imagine the '57 CD would be). So I'm sure it's more a matter of what you want from your next amp and whether you are happy to use pedals for dirt or prefer an over-driven amp (and can run it high enough to achieve that sound). Of course the obvious answer is to get both.