My favorite Rush-sub hosts are Walter Williams and Tony Snow. Hannity is bright but he is frequently lightweight.
We get Hannity after Rush down here, and he's slipped. Still fun to listen to, but the old fire isn't there anymore. He's always so busy pushing his latest book that it's not funny.
But I would subscribe to Rush 24/7 if he ever got Laura or Ann(even better, get both as a tagteam) to guest host, as long as they promised to keep the Dittocam on for the entire 3 hours. ;^)
I like Walter Williams too. He is very bright and has a good style. He is also a libertarian so I agree with him even more. Having said that, Rush is still in a league all his own.