any suggestions on other blocks? or are they all similar in performance?
The thing to bear in mind is it's the final combination that counts.
You can have the best blocks in the world, but partnered with a bad radiator or pump and you'll get sucky performance.
You can have the worst blocks in the world, but the best radiator and pump, and beat the hell out of a rig with the best blocks and the worst of everything else.
You can have the best of everything, but the worst fans possible, and be outperformed by a Â£50 taiwanese piece of junk...
A single item can let down the entire loop.
Don't think of a watersystem as individual items. You have to think about it as a whole and match up the right items around the loop for the best performance.