I guess if I had to decided on my preference, it would be two graphs.
1) pumping powere vs cpu temp as you've already done.
2)flow rate or pressure drop...maybe flow rate vs pumping power

Then people can decide for themselves what's important..

Also wouldn't hurt to have some sort of scoring on mounting system since it is really important that its easy. A difficult block to mount might be a good performer for someone with a lot of testing experience, but perform poor for those mounting a block for the first time. This is probably not emphasized enough..