Nvidia GTX 970 would work well with right parameters.

Here is my setup, that gives close to 900 h/s. Important part is "-l 13x78"

ccminer -o stratum+tcp://52.8.47.33:3333 -l 13x78 -u aeon_wallet_address -p x -A

You can find ccminer for nvidia here: https://bitcointalk.org/index.php?topic=641696.msg12800804#msg12800804