Legend of Basara would make for the most epic drama. And considering that the anime adaptation is only thirteen episodes long and doesn't even complete the first story arc, the overlords owe me big time on this one.
Loveless and Gravitation couldn't be adapted to live action and be true to the original story, since they imply certain things that are illegal IRL (even if it's only hinted at but in a positive light, I'm pretty sure it'd never get past censors, for good reason) but hypothetically speaking yeah they'd be fun live. Sukisho too for that matter. Gakuen Heaven could totally go live (taken from the anime not the manga which is much raunchier lol)