What do you think is the best soccer cleat? That causes great power?

Do you like the new Puma v1.10 K.I was also thinking of the Nike Mercurial Vapor IV FG Cleats but they look like they cause really bad blisters! I want to buy a new pair of soccer cleats. I have the Umbro Speciali's now and I love them, the only problem is that they are so heavy when they get wet. I also need cleats that don't cause bad blister's. I get terrible blister's on my heel. What do you think is the best soccer cleat?