Watercooling?

[YOLOSWAG27]

I built my first computer nearly months ago now and I am thinking about getting a watercooling kit when I have the money. I was thinking about getting the XSPC RayStorm 750 RS240 WaterCooling Kit but i am new to watercooling and don't know if it will be simple for a begginer like me and if it will cool my cpu enough for some high overclocks (5ghz +). The stock cooler for my CPU @4.0GHz just manages to keep it below 85 degrees under load so I a better cooler.

Does anyone have any advice or recommmendations before I buy this kit?

PC Specs:
CPU - Intel i5 2500k (sandybridge) 3.3GHz @ 4.0GHz
RAM - Corseair xms3 2*4GB 1600MHz
MoBo - Gigabyte z68x-ud4-b3
GPU - Gigabyte GeForce GT 640 OC 2048MB GDDR3

 

[stuie]

for the extra money id go with this and get a d5 pump

http://www.overclockers.co.uk/showproduct.php?prodid=WC-145-XS&groupid=962&catid=1532&subcat=

Although what case do you have thats normally the decider as to what options you have

 

[YOLOSWAG27]

So whats the difference between them performance wise? Is it worth the extra money? I have a small case at the moment but I am planning on getting a full tower with plenty of space for rads and tubes