Quasar and Nova Prime vs Guy Gardner and Kyle Rayner
If there's one crossover I'd like to see, it's Kyle hanging out with Nova and Quasar, just zipping around the universe doing cosmic stuff.. One crossover wouldn't be enough, it would have to be at least 7 issues, maybe more..
GL's should just use the battery as a ring anyways, like Agent Orange. Hell, they could probably shrink them down and wear them as a ring if they wanted to..