The Corsair Crystal 460x case isn't really well suited for watercooling. I'd much rather have something like the Lian Li PC-O11 Dynamic. It is however quite compact and has two glass panels front and side to show off stuff.
My temps are decent with the one 360 radiator. The 8700k is clocked at 5ghz 1.28v (liquid metal) and 2080 has a mild OC (am power limited) and boosts to ~2055mhz after its dropped a bit from heating up. I get around ~64c max on CPU and ~55c max on the 2080 during AC Odyssey with the fans set to 900 min - 1350 rpm max, pump speed max (38-40 dba max measured with phone maybe 35 cm away). It's very pleasant.
I theoretically could just about put a 240 radiator up top but I'd have to lose the RGB RAM sticks for very low profile RAM (I think Corsair LPX would work). Also about 2.7-3cm of the top of the motherboard would be hidden which I think is a shame with this board and on the practical side it would be hard to access fan headers, debug LED, memOK! button if ever needed so I'm not sure I'll bother. Plus I could be wrong and it might not fit.
I couldn't remove the front bottom shroud because it's the only place to keep a 3.5" mechanical HDD and my power supply is not the shortest with a lot of individually braided cables to hide. The back isn't the most generous and you do have to zip tie everything to make putting the side panel on easy.
This meant I had to put the pump/res combo underneath the GPU horizontally. On my particular pump/res combo model having it mounted horizontally gave me some headaches while filling and bleeding but I've worked out a method and should be easier in future. There's still a minor issue: At max pump speed some leftover air in the res leaves the pack and enters the pump causing a gurgling sound but it's very rare so I can live with it and I've tried hard to stop it completely.
The GPU block is a copper/plexi version. I bought it cheap in auction and there wasn't much choice available. I'd rather have the nickel/plexi version to match everything else but since the GPU is not mounted vertically it's not really that noticeable so it's all good.
I spent around £1350 total to get it to this point but that's taking into account sales of my old gear so it's not a totally useful figure. I bought mostly used or new with special offers and upgraded the core components at least twice so it's complicated but that's what I'm down since starting the upgrade adventure January of 2018.
I started with: i5-3570k ASUS P8Z77-V motherboard 8gb DDR3 Corsair LPX Antec 620 CPU water cooler AIO 120mm rad MSI GTX 970 Gaming 256gb Samsung 840 Pro SSD 1tb Samsung HDD Corsair 600T case Seasonic 550w power supply ASUS 24" IPS 60hz monitor Asus Vulcan headset original Corsair K95 keyboard original Logitech G502 non-rgb Logitech G440 mouse mat Logitech Z323 2.1 speakers
So almost every component has been swapped out except my speakers plus around a third of the money went to new additions such as the custom water loop. The keyboard was a free small upgrade due to RMA'ing my old original K95.
I know the current prices for everything in the new setup plus my speakers, a delidding service, cable combs is around £3000 new from retail.