1. Johnny Gilbert- Many would agree he is the GOAT of game show announcers. My favorite of his is on the good David Ruprecht hosted Supermarket Sweep where he gives play-by-play announcing of the big sweep. He is great on Jeopardy! as well, recent additions of him reading movie category clues made him even better.
2. Gene Wood- good on Classic Concentration and Password Plus
3. Jamie Anderson on Person, Place, or Thing- several funny quips
4. Kira Soltanovich- You Bet Your Life with Jay Leno
5. Jim Thornton- Wheel of Fortune announcer for the last 13 years now

I'll go with Johnny Olson as my favorite, but partially for an odd reason. In addition to his announcing for the great Goodson-Todman game shows, he was also the announcer for the openings and closings of Wally's Workshop...!

It's my all-time favorite home improvement show, starring the late Wally Bruner (who was also known as host of What's My Line? for a spell) and his wife Natalie.

I'm familiar with almost all of the game shows you've listed, but my memories of announcers become more hazy as time goes on.

Top Two for me --

1. Johnny Olson

2. Don Pardo

I strongly agree that Johnny Olson is the best game show announcer of all time. He originated one of the most famous catch phrases in game show history "Come on down!" He was also the announcer on Jackie Gleason's variety show when it was produced in Miami Beach. Each week, you saw the Atlantic Ocean shoreline and Olson exclaiming "From the sun and fun capitol of the world."

Johnny Olson became the announcer on the original What's My Line? around 1960 or 1961. Most shows were done live, and his opening went, "And now, live from New York, let's meet our What's My Line? panel." And the panel would be introduced one by one, the women entering with their finest gowns. Really a classy show. And most of them preserved on kinescope.

1. Johnny Gilbert
2. Gene Wood
3. Charlie O'Donnell
4. Rod Roddy
5. Johnny Olson