What CPU block?

[los]

I currently have 2 x 240 rads and a D5 pump cooling my cpu and GTX780.
Looking around the supremacy evo generally comes out on top (I have a supreme ltx) Are there any others that I should be looking at for a similar price £50 or less?

 

[los]

It's actually a plexi top I'm after. I'm guessing the mx can't be as good as a supremacy evo?