The 470 is an okay deal IMO if it still has warranty, but I would rather get a new card from the HD6X or GTX5X family.
For around $200, your options are the 5870($205), 6870(~$205), and 6950($240) from the AMD side, or the 560($230) from Nvidia. Performance wise the stock 6870 is about ~10% worse than the rest at 1080p.
Depending on if your resolutions high enough, I would strongly recommend the 6950, it has excellent power draws, scales great in CF/Eyefinity and could be unlocked to a 6970.
But since it seems like you are more comfortable with Nvidia, the 560 is a nice card also, the reference cooler is amazing with a slightly lower power draw compared to the 470. With rebates you can get it down to ~~$200 too.