1440p Multi-Monitor Confusion! Looking for a solution!

[Wizzrobe]

Hello! I'm looking at building a system with a multi-monitor set up in mind. I was hoping to get 2x1440p monitors (one in landscape position, and another in portrait position). I'd like to use one for gaming, the other for miscellaneous things. I just have a few questions about how to choose...
(Budget is a non-issue. But, I'm always happy to hear about cash saving ways to do things if the performance difference is negligible).

Also I'm not a really competitive gamer. Is 144Hz refresh rate really...worth it?

TL;DR:
How well can a single gpu system handle two 144Hz 1440p G-Sync monitors if only one is being used for gaming at a time? Should I just go with one 60Hz and one 144Hz? If I do that, is there a noticeable difference (screen lag) when using both monitors for misc tasks?

Longer version:
I know Asus is releasing a 144Hz IPS panel 27" monitor. Now that looks snazzy. I'd like to have it, and use it for gaming. However, given the really high refresh rate, I'm certain it'll require a powerful gpu. That's fine. I'm wondering though, how well can current gpus (preferrably on the green team) handle such a monitor? How well can they handle two, if only one is doing the gaming?

Note I'd prefer to use just one single gpu, be that a Titan X, gtx 980, or the upcoming gtx 980ti. I am willing to go SLI if it's necessary, though.

Q1) Is there a noticeable difference between using one 144Hz 1440p monitor for gaming and one 60Hz 1440p monitor for misc purposes simultaneously (like, is there a noticeable lag when switching between the two)?

Q2) Could current graphics cards handle one 144Hz 1440p monitor for gaming, and a second 144Hz 1440p monitor for misc, simultaneously?

Q3) If using one 144Hz 1440p monitor, and one 60Hz 1440p monitor for misc tasks, (both of them for editing code, for example), would there be a noticeable difference when switching between screens? Like dragging windows over, etc? Or am I better off going with two screens at the same refresh rate?

Q4) Assuming it is possible to have two 144Hz 1440p monitors, could I add a third later on? (one 144Hz, two 60Hz, or two 144Hz, one 60Hz, or 3 144Hz or 3 60Hz?) Or would that require an additional card?

I know that SLI has a few issues. So I'd sooner go with one Titan X over two gtx980's in SLI. But if the latter does perform better in general, I'd like to know. Also, the 144Hz monitor I'm considering has G-Sync.

 

[jbaker22]

If you use a 144hz display you will get used to it, and a 60hz display will become harder to use, but it depends on your body if the extra frame help you game. That means the transition from looking at the 144hz to the 60hz may not be pleasant. Using a second or third should not stress the gpu too much in the way you want to use it. The 980 ti performs just as good as the titan X.