In a word, yes. You'll be fine.
I have the 2500K, and it runs everything (including NFL Blitz) at 100%, including HLSL. The only exceptions I've found are multi-monitor games (Punch-Out, Darius, etc.) and I don't know if that's due to the iGPU, or Mame's implementation of HLSL-- unfortunately I also have no way to test (no room for discreet GPU in my build.)
Turn off HLSL on those games, they're 100% playable.
That said, unless you already have the 2500K on hand, why not wait a month and put a Haswell in it? LOTS of advantages for bartop build.