Watercooling help please!

Ok got some cash together so gonna complete my watercooling rig this month (woohoo).

Anyway I am a slight water noob so not sure on a few bit.

Firstly I have already got a 1/2 DD Res and a 1/2 BIX, so I need 2 blocks (cpu & gfx), a pump, and some tubing.

CPU Block I am thinking white water cascade.

GPU DD Maze 4

Pump no a scooby? Possibly Hydor Seltz L30 or Maybe a Eheim 1250, I want to keep it pretty much all in the case so would prefer a small (dimension pump).

Tubing Tygon.

What adatives should I be using?

Mainly want advice on pump as I am pretty much decided on everything else.