Welcome to the forum
I would recommend the use of a cuplex XT di with socket 771 mountings with two connectors.
For the rest you could use the High End 240 Supply Kit with aquastream 12 V pump. This kit contains everything you need.
It might be useful to order a pump upgrade (ultra version) with this kit because it will allow you to control the fans temperature controlled or manually over the pump and the aquasuite software respectively.
In this case you should also get an y-adapter because the pump has only one fan header.
The water reservoir should be above the pump because it will allow for an easy filling. Well, you could also place it somewhrere else but you might get some trouble when filling the system.