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I have personally never SLI'd 560's but I have heard of good success doing so.
I guess BF3 was giving you some kind of driver complication, and BF3 can be a tricky bastard to get running properly.. you may want to adjust some of the in-game settings or post on the forums on Battlelog with your current issues and see if you can get some help.
All else fails.. Newegg has GTX480's for $209 and GTX670's for $420. (Hint: go with the 480, if its still on sale.. it even beats the 670 in many benchmarks still.. the only area where the 670 does better than the 480 is the texel fill rate, and less power/heat/noise.)
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