Most reviews showed that RX series cards don't really have enough headroom to justify a water cooler of any sort. Any non-reference cooled card was about as fast as it was going to get. More cost effective to pick up a faster GTX1070, or now that Vega is around the corner, one of them (if you can get one).
For 'multipart' setups, getting pump/res/rad combo and a single GPU block isn't too bad, just need some fittings. At that point, tossing the CPU into the mix is relatively inexpensive. Check out Swiftech products, or you can look at EK's quick disconnect parts. Pre-filled GPU blocks and plug and play to a pre-filled radiator/pump/res.