Who available would be better than Ramon? He's already in LA, familar with the team and played decently with the bench when Brown had the balls to run him with the bench.
I can't think of any defensive pg on the market, let alone one that wouldn't get snagged up by other teams. Ramon looks like the best bet for LAL. If someone better comes along for around the same price I'd love to add them but that guy doesn't exist. I'd settle for a less talented guy for cheaper. Maybe one of the rooks can fill that role, I hear Johnson-Odom is pretty decent defender.