MCP355 with XSPC top
Great compact combo, which I use myself. However if space isn't an issue, then go with the MCP655.
And just so you know, you should get 1/2" ID, 3/4" OD tubing to fit those compression barbs properly. 7/16"ID 5/8"OD isn't going to grab as tightly.
Definitely do NOT put PT_Nuke in with Feser One Fluid. It's one or the other, and if going with PT_Nuke, you need some distilled water as well (mix it at the proper ratio). Feser One Fluid has everything it it already.
As said above, go with a 120.3 radiator if you plan to add a GPU.