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You seem to be wanting to go for a showcase build, for which case - it's fine. The problem with all the pastel type fluids is that after being run for long enough, they all tend to leave gunk inside your loop. If you're looking to build your loop and just leave it for a while - use something like distilled water.

Water cooled power supplies are a joke yes, don't go for one. Your power supply is... fine ; but would definitely not be my pick and I'd go for something higher end for a 3950x / 2080ti build Generally I'm not the biggest fan of thermaltake powersupplies but as you seem to like their stuff - consider going for something like a Toughpower Grand Platinum.

All the boards you've chosen seem fine. Honestly unless you need some specific functionality out of the board - just pick one, it won't matter. There's a point where it's just personal preference and people will just give you different answers. Personally always been a huge fan of Taichi boards but that's just me

It seems like two standard pcie 8 pin connectors - nothing too unusual. How many pins does your gpu take? I've had a variety of different gpus that wanted all kinds of different pins. Your power supply should come with the cables you need but adapters are readily available online.

Just make sure your monitors are under the max for whichever of those monitor arms you get. Some larger higher end monitors can definitely be pretty heavy and I've had monitor arms struggle before. Regardless it's amazon. Why not purchase them and see if they work for you? You can always return them and look into another option if they don't end up suiting your needs.

Cat 6 still isn't necessary for most homes at this point, but the price difference isn't huge most of the time. If you're having new wiring done - there's no reason to not go with cat 6 and make sure you'll be good far down the line.

I currently have gigabit internet through Comcast and have been using one of their modem/routers which are obviously not the best. Over ethernet I have no issues getting gigabit and reaching the proper speeds, but if I'm using wifi - even directly on top of the router I'll max out at maybe 150Mbps and the range is absolutely horrible. 30 feet away through one wall, and I get 20Mbps and horrible latency issues. I'm looking to get a decent wifi router that can provide gigabit speeds with a fairly good range, but am not sure which one to go for. I need to be able to game on WiFi as running ethernet to my pc isn't an option for me currently and nor does powerline seem to work well with my house. Could anyone recommend some good ones that wouldn't break the bank too much? I was considering this NetGear one? Netgear Ac1750

Why not go with an SSD?

Yes they're "legitimate". Shady like most prebuilt sellers - but if you're asking if the product will actually get delivered, yes they're legitimate in that regard. Although it's interesting to note ( and another thing one must wary of ) ... They do not truly take returns.

Looking over everything they seem like a small company but like they're fairly legitimate. Their prices aren't the best though, any particular reason you're looking into them?

Interesting - the difference hasn't been huge from my experience ( but I have quite good ambient temps I suppose )

What speed is the Ram you purchased? For most lower-mid end builds you'll be fine just using a decent 500w psu from any reputable brand.

"My budget isn't huge" can mean a different thing for everyone. Could you provide a rough idea of the amount you'd ideally like to spend? Off your post alone my thoughts go to a lower end Ryzen cpu and something like a 1650 super.

I used to use a 240mm corsair aio. Good stuff. Worked great even though I was missing the mounting brackets and attached it to the board with zip ties

I suppose, but the options won't actually change anything -it seems to me like buying most air coolers ( like under $40 ) instead of just using the stock one on Ryzen is throwing money into the wind as the difference shouldn't be all that large. If you're upgrading from stock Ryzen cooler it only makes sense to go for the more performance based options like a mid-high end air cooler or an AIO as the lower end air coolers won't do much for you.