Sadly, as much as I feel Guy is my favorite GL. Yes I am one of the few who believes Guy is the perfect GL. Out of all the 2814, I could see him being the one to take the Avarice ring.
Honestly, he has often been rather lacking of self confidence that presents itself in the macho bravado. While Hal is Johns favorite sock boy and they want to make him the rainbow lantern. Guy fits for going avarice, not going evil just preying upon his inherent weakness.
Then again I want to see Guy have one huge fight where he has hopeless odds and saves the day by pretending to fall to the avarice ring but then fights dirty and drives the yellow back into the darkness...then again I think he is due for the one big victory...