The DGX670 certainly isn't a Genos (using the sx600 chipset) but it *is* still really good, with it's 88 keys and 4 way speakers. If you're not using your Genos, now is *definitely* the time to sell since demand is really high.
Just keep in mind you wont' have access to revo drums/ rhythms, Super Articulation 2 voices, and any sample library downloads (like regional voice packs or new piano sounds).
If you're *not* going to use any of those features? You should definitely look at a DGX670. Heck, I have an s970 and a CVP309, I'm still considering swapping those 2 for a Genos and a DGX670 combo; although more likely a Genos + (P515 or Modx8) combo.
Mark