You can easily get a PC that will play smoothly on ultra for under $1k. The GTX 970 is around $320 and includes The Witcher 3. An i5 4690k for around $220. You can save a little more without the k if you don't plan to overclock. A good board for around $100. 16gb of ram around $120 (only 12 is really needed atm), a good ssd for under $100 (not required, but nice to have), a seagate 4 or 5tb external drive for around $120 (with 120-180 mbps transfer rate it will play DAI really smooth). That system would do 1440p no problem.
That system seems nice and all, but how viable will that 970 be before it needs to be upgraded again? Lately PC games have been becoming more and more demanding by leaps and bounds. I personally wouldn't buy one. If I needed to buy a card today, I would buy a 980. Luckily I don't, so I will wait for the direct descendant of the 780ti.
I have a hard time running maxxed out DA:I at 1440p with my setup:
i7 4820k @ 3.7 w/ Corsair H60 cooler
GTX 780ti Superclocked w/ ACX cooler
Gigabyte X79-UP4 mobo
16GB ADATA RAM
EVGA SuperNova 750B PSU
With every in-game setting cranked (including fade-touched textures) my system would sit at around 27 - 30fps in open-world, with about 20fps in cutscenes, which is not acceptable to me. Folks say you don't need to use the in-game MSAA when using higher than 1080p resoultions, but I sure noticed a difference. I hate jaggies, and I will gladly play a smooth 1080p game over a jaggy 1440p one.
Just saying, I have the AMD 290X and play this on mantle not directx. Not a single crash and beautiful graphics.
I'm using a 780ti on directx and not a single crash and beautiful graphics. Just saying. 