Twilight Render is only $99. At least it currently is not a subscription so the $99 is a one time charge Not all that expensive if you plan to use it for more projects in the future. Wish you luck in what ever direction you go.

Just an update... It seems that the rendering with the GPU withing vray is working, but not when i'm using vray via animator... for an 800 * 450 pix image, it takes 58 seconds. I'm using Cuda with CPU and both cards selected. Any idea ?