Return of Reckoning

This GPU wont be able to handle 3440x1440 properly

Sorry, I meant that the game works in 3440x1440 fine without stretching or forcing it to be 16:9 with black bars either side.
Your right, performance of the PC to do that resolution is another thing.

price starting at 1800$, with that money you can buy a good tower and a big monitor.

Just build your own. It's easy and you'll save a lot.