Definitely don't buy a 5500XT. It's just a more efficient RX 580 at a higher price. GTX 1650 Super offers the same performance, similar efficiency to 5500XT, but has the NV encoder and is cheaper. 1650 Super makes far more sense than a 5500XT.
You haven't told us the prices you'd be paying for any of the GPU's you've listed though, so we can't really say which is the best option. It's quite likely none of them are your best option though IMHO.
Don't buy a 32" 1080p monitor lol, that will look god awful. Heck even 27" is too big for 1080p. You should be able to find 27" 1440p60Hz displays pretty cheap these days, that's what I'd be looking at tbh.
I'd probably change that motherboard. If you're set on X570, get the MSI X570 Tomahawk or an Asus X570 board. I'd probably just save some money and go with B450/B550 in a build like this though.
I'd change that case. Enthoo Pro is a perfectly fine case, but it's ancient now. There are far newer, nicer, better options, likely at a more reasonable price as well.
Oh, and the cheap Cooler Master AIO liquid coolers tend to be crap. I'd stick with a decent air cooler, or if you're going to go with an AIO, just pay the price for a good one. *EDIT* Then again, you're running an R5 3600, so you're unlikely to see any temp issues, just maybe not get a whole lot of life out of a cheap CM AIO, but AIO's inherently have a limited lifespan anyway.