So notebookcheck run a thorough benchmark of the new Titanfall game with many mobile GPUs from lowest end (HD4000) to highest end (GTX 780M and higher).
The results are that Titanfall does not require much, by today’s standards, even if you want to run it on very high settings @ 1080p. A GTX 765M could easily run it on an average of 35FPS@1080p on highest settings. This means a GTX 860M/GTX 850M should be more than suffice to do it as the GTX 860M is around 25% aster than GTX 765M, at least.
Such laptops should be available for around $800-$1000.