That's a 550 which is why my search didn't find it. Either way, not quite the same, I'm looking to see also whether or not the 660Ti greatly outperforms the 660 to warrant the extra $75.
I would also choose between the 660ti and 7870 and avoid SLI. Check some benchmarks and reviews of each and see which one plays the games you like the best. I use both companies gpus for different things. I render 3D and fold on Nvidia, game on AMD and use a Firepro for workstation apps. It will give you the best bang for your buck by choosing the right card for what you want to do.
I was going to referred to blazorthon comment for info about downside of SLI. but could no edit post.
I think the 660 falls in the twice the performance of 1 560 area.