Congrats on the straight 664 @Jkingrph!
@Ian, I most certainly recommend the 663M/664M scopes. Kowa's team have been incredibly supportive for me as well. The colors, contrast and sharpness of the 660 series are a delight! We made some twilight observations yesterday, we did have to dial the 20-60 EP back down to somewhere around ~25X for improved brightness. Let's just say the pinks, the blues, and the various mixtures of them in the sky were rendered in a HUGELY appealing way than another much more expensive optic we have access to.
I don't know if the 82 series you have has a dual focusser, but you might want to try to see if you prefer that design better. Kowa hasn't yet incorporated it in the 663M/664M series. The Opticron MM4/60 that Marc mentioned does have it. As you probably already know, the FoV on the 20-60X EP is average / lower compared to the competition. That said, except when trying to place birds in flight at >35X zoom, the 20-60X EP hasn't bothered me at all with its FoV. You might want to make sure you like at least that or the wide angle 30X fixed before considering the 660 series.
All in all, we use the 663M a lot, and we love it when we do. You might well share the same level of enthusiasm as I do for the optic. If you can get it as a demo/on sale (<$1300) /a good used copy, that would be great.
Cheers,
Kumar