For the time being you will be able to use 3 GS plugins: GSdx v0.1.16, ZeroGS v0.97.1 and GSnull driver v0.1.0. GSdx v0.1.16 is a DirectX 9 and DirectX 10/11 plugin by Gabest which recently got greatly improved in both speed and image quality. It requires pixel shaders 2 and SSE2 to work and Vista/Windows 7/8 with a DirectX 10 compliant graphics card for the DirectX10/11 mode.