Briggs and Peter are both big punchers and have a history of bad blood between them. I remember a few years ago when Briggs put a picture of himself on fightnews saying that all he "wants for Christmas is Sam Peter's two front teeth!" It would be a fun fight while it lasted and someone would get koed...probably Briggs!
Brings Vs Wladimir is the best fight. Briggs has the best chance to upset Wlad. He's big and can deliver a quick powerful counter. Briggs will force Wlad into a shoot out. No matter who wins, It will be short but interesting. Vitali's chin will allow him to last the first few rounds, after which Brigs will be exhausted. Same with Valuev. These match ups are not very interesting. Peter may be able to last, but I think Briggs would knock him out. Perhaps I'm too harsh on Peter, but I just don't think very highly of him. He's slow, has very little skill, and even his power has only helped him defeat bums and cans. They say his chin is good, but McCline decked him thrice, and McCline wasn't a huge puncher.
Since Wlad will be fighting Peter - his brother might as well fight Briggs - if he's not going to get Valuev.
Peter because the Klit fights wouldn't be remotely competitive. And I hate watching Valuev fight, so that rules his neanderthal-looking ass out.