13 wrote 1440p;
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4k;
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Ultrawide;
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2 ultrawides together, next to another 1440p monitor would take up a ridiculous amount of space. If you get an ultrawide, get one.

Over your budget but this would be a baller move;
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3440x1440 ultrawide, 100Hz, G-Sync. The Z35P is a TN panel, X34 is IPS so X34 will be better for content creation. You've got a 1080Ti, which will handle either of these monitors really nicely.

I like the BenQ one that you linked do you know if it is any good because I see no reviews on it I could probably search other sites now that I think about it. And if I went with the 4k if I ever decided to do a Racing sim or any game like that would I be able to use all three monitors and downscale the 4k monitor to 1440p or would that mess the scaling up? And as for the x34 I originally bought this instead of my Current Asus PG279Q monitor but I didn't like it very much, I don't know what it was about it but I guess it wasnt really for me as a main gaming monitor I didnt try it for content creation at the time so it would probably be good for that but I want two more monitors one on each side so I would say I might buy it later down the line for my other setup.