Interesting, I expected Trebek and Clark to be higher, like 2 or 3-ish...
For those who care, I put Dick at 2 and (hold on!) Alex at 1. Why? With Dick, pure and simple, he balanced the lighter and more dramatic parts of Pyramid better than just about anyone else I've ever seen host such a game (yes, even Bill on Pyramid). He'd let the stars and contestants dominate the show, run it to near perfection, and still be witty...
With Alex, every show I've seen him host, he's always surprised me with how versatile and seemingly genuine he was (except for those times on Wheel, but...). He's done EVERYTHING in game shows, from word games like CC, which I think he hosted the best of all of them, to luck with High Rollers, pure trivia like Battlestars and Jeopardy, and even panel, with TTTT. All of them, in my mind, wouldn't have been as much fun without him at the helm. He can keep the game running well, can still be fall-on-the-floor funny, and make it all look effortless.