Andy, I play the Nike 71's , 81's and also the max mate , just depends on how my meter is , and to be honest , theres very little distance difference for me , as I don't use full backspin a lot. The stopping power is there if needed with the level 81's though.
PS, The nike 80 are the same as the the nike 70, except the slower meter and same for the 81 and 71