Karsten75 :
Your temperatures don't sound out of line and enough to justify a liquid cooler. Are you sure? DO you want an all-in-one (closed-loop cooler) or a custom built cooling loop?
So this is my current rig
Case: Thermaltake Level 10 GT Snow Edition Full Tower
CPU: i7 4790k MOBA: MSI Z97‑G45 GAMING ATX Motherboard ‑ LGA1150 Socket
GPU 980ti Hybrid [SLI]
PSU: Rosewill 1300 Lighting PSU
RAM: G.Skill RipJaws 32GB DDR3 2133
Currently upgrading 2 the 980ti's
So i plan on doing water cool with them as well