Laing DDC or D5 for a pump, if you get a DDC get a XSPC Plexitop Reservoir, the D5 is a more powerful pump. For CPU blocks get a D-Tek Fuzion v2 or a EK Supreme, the D-Tek has no see through top whereas the Supreme has an option of that. Thermochill and Swiftech for the radiators, swiftech also sell the D5 pump branded as an MCP655 there's two different types one with speed control and one without and the 655-B is the one without only a £1 difference in the price. The DDC gets hot so mount it near a fan or where it will be well cooled, although don't mount it upside down (you wont if you have a plexitop anyway). Tubing you can use 1/2" or 7/16". The latter is harder to fit on but there are ways of fitting them, the best tubing is tygon but it's also more expensive. the masterkleer and xspc tubing is also good. Fans I dunno, Yate loons scythes noctuas are all good fans, depends on what radiator you are going to get. The Feser Xchange radiators are also good but cost alot more than the thermochill (which cost alot already).
The custom kit will cost more than the one on scan but it'll perform better.