Looking for advice on best replacement for my GTX 670 since I've upgraded to 3 monitors (5760x1080). I want something good enough that will last about 2 years and be able to bump up settings on X-Plane flight sim (HDR lighting, AA, etc.). I can budget as much as $1000. Can also get one decent card now like a 980 and get a second next year for SLI if that's the best option. I'm leaning toward 2 x 980 SLI but not sure if that's overkill. Open to other options. Thanks!