Whynot

Here's the thing, are you spending 2000-2300 because you can, or because you need it? You can achieve immense gaming by running dual 970 cards which are significantly cheaper than 980s or Titan Xs. Honestly I'd opt for one 970, play on it (still very well) and wait for the 980 Ti line like Brian said above.

With multi-panel 4k support not being a major focus of game developers (or even 1080p at this point), major noticeable differences in game experiences seem to be minimal at this point -- with higher resolutions and multi-panel displays really shining in the workstation environment.

Unfortunately, NVIDIA appears to have pulled a lot of work-station capabilities (such as floating-point precision) out after the Titan series preceding the Titan-X.

Therefore, 980ti seems like a good choice for a gaming rig, while the Titan series is only moderately more efficient with gaming while losing all of the non-gaming thunder that originally made the Titan series a more appealing, one-size-fits-all solution.