I freaking fell in love with the glaive from the first moment I used it! I love either the first one or DBC one, its hard to pick. They both look awesome and I love the effects! Not only is it fast and easy to use, but packs a fair punch. Not as much as the maul, but I appreciate the quick, cutting blows of the Glaive. Its one of my dream weapons!
As for the plasma caster, I found the first and second models depressingly underpowered. One of the downfalls of the game in my opinion...