Hey Nightfire, I run a triple-wide setup, so to add to other's advice here:
You don't need curved. The curve is so slight it might as well not be there. I've used curved 23" monitors right next to a flat 23" monitor and couldn't tell the difference unless I looked for it.
G-Sync is a guarantee of quality, but you pay a premium for it. FreeSync can be just as good, but the standard is looser so you have to check the monitor specs for each monitor - particularly when you're shopping cheaper brands. Specifically, you need to look at the sync range with regard to the lower figure. The AOC CQ32g1 you linked has appears to have a sync range of 30-144 which is really good - it means that it will look perfectly smooth from 30fps up to 144fps. That lower figure is the most important one since that's the minimum frame-rate you need to maintain to look smooth. Some FreeSync monitors have a narrower range, such as 48-144, which means that you would need to adjust your game settings respectively to keep the framerate above 48fps at all times to keep it smooth. It's not a deal breaker, just something to keep in mind as you may have to lower your graphics settings with such monitors. Generally if you google, you can find someone who'll confirm that it can work with Nvidia, but it's honestly rare for a FreeSync monitor not to work with an Nvidia card.
Your PC should have no problem driving triple monitors in games - it's actually a lot less demanding than VR, IMO - but you may not be able to max the graphics settings in the latest games like ACC. I don't think that's an issue, personally, since the game still looks great even at reduced settings. For example, an i5 and RX 480 can maintain 30+ fps at 5760x1080 (1080p x3) at medium settings in ACC, and your PC is a lot more powerful. I wouldn't worry too much about it, but if you're really concerned I can try ACC on my PC to give you an idea of the kind of performance you could expect.
As far as panels, IPS is really nice for richer colors and better viewing angles, but it's more expensive. VA is next best, and is generally cheaper. TN generally has the worst viewing angles and color reproduction and is the cheapest panel (though it may have deeper blacks). I honestly haven't used a TN monitor in years, but I remember they used to really wash out if you dropped your eye line below the top of the screen. Hopefully they've improved since then.
Size is king for racing as it increases your field of view and just gives you more of the game to look at. 23" is the minimum, and at that size you're often either cutting off the top of the windshield or the dashboard and wheel. Everything larger is purely better as you effectively get a larger window onto the track. If you can, I would shoot for 27" or larger. The AOC CQ32G1 at 31.5" would be fantastic!
If you're at 27" or larger, a 1440p monitor will look better, but 1080p honestly isn't a deal breaker. It won't look as sharp, but it's most noticeable on text, and when you're driving things are moving so fast you probably won't pick up on the lost resolution. It's a good compromise if you're on a budget, and a lot less taxing on your system. For example, the AOC C32G1 at 1080p is only $210 where the CQ32G1 at 1440p is $299, so that's an acceptable way to save $270. If it's a choice between a 31" monitor at 1080p and a 27" one at 1440p, I think I'd take the 31" at 1080p for racing - it'll give you a much bigger window onto the track, be much more immersive, and still look much sharper than VR.
And lastly, HDR is really, really nice - these monitors may also be branded FreeSync2. I think it's a huge leap in picture quality on a display with good HDR support. They generally have wider colour pallets and greatly increased brightness to make lights really pop - night driving looks amazing. If you're seriously considering the AOC CQ32G1, I would look at the AG322QC4:
https://us.aoc.com/en/gaming-monitors/ag322qc4. It's only $20 more in the US, and I would gladly pay $20 more for HDR. Now, HDR support in Windows is, I believe, still kind of crap at the moment, and not every monitor has a great HDR implementation, but I think both should improve as HDR becomes more widespread. And after seeing the difference HDR makes on a nice TV (like an OLED), I would want HDR on any new monitor I would get.
And triple monitors are awesome - I use mine for every game I can. FPS, RPG, Action, Arcade Racing..., the increased field of view and immersion is awesome, and going back to a single screen suddenly feels like you have blinders on.
Hope that helps.