The GTX680 just came out at $499.99, although it is now sold out most places. It outperforms the 7970, so at $550 a 7970 it isn't really a good buy unless they lower it to about $449 or less. The GTX680 supports 4 displays, 1 per output. It would outperform your crossfire setup by quite a bit. I believe with AA turned on at 1080P it performs slightly under a GTX590 or AMD 6990.