GPU Decision

I need help deciding what GPU i should get and here are my options:

Evga GeForce 660 Superclocked 2gb

Evga Geforce 650 Ti Boost 2gb

HIS IceQ HD Radeon 7870 2gb

Also thinking about getting a second one of whatever card so I want the best preformance in SLI or Crossfire

7870 is the best for gaming.

7870 all the way.