I am done testing:
LR Cacade
Dangerden RBX
and halfway done with the Dtek Whitewater.
When I finish the Dtek block I'll post reviews of all three either at once or over the course of a week.
I am going to test two waterblocks next because they were sent to me long long ago:
Dangerden Maze4
Heatkiller 1.5 from watercool.de
Once I am done with those then you guys can pick the order! Other blocks I have here include:
LR whitewater (the original)

MCW5000-A (I lost the replacement springs Bill sent but should have new ones next week)
Joemac's Aquajoe block (waiting on AMD mounting hardware)
fixittt spir@l in both copper and aluminum (perhaps of interest as they are identical other than material but older blocks for sure)
Swiftech MCW462UH
Dangerden Maze3
Think that's about it for modern wbs and the last few are really more for comparison between what you may still be using and what is best available now.