A Century Ride every month?

I signed up for the Death Ride. Oh dear, what was I thinking? Now my partner and I are talking about doing a century every month to help prepare. Thanks to Andy C, one of my member riding buddies, for that idea. Whereas Andy C just went out and rode 100 miles at least once a month in 2008, my partner wants to ride a supported century once a month. Thus I am hoping for some help from all of you out there to determine this lovely century schedule. I've found the following:

Cinderella Classic on April 4th
ACTC's Tierra Bella on April 18th
FFBC's Primavera Century on April 19th
Wine Country Century on May 2nd
Tour de Cure in Napa on May 3rd or Grizzly Peak Century on May 3
Western Wheeler's Sequoia Century on June 7th
Tour de Cure in Palo Alto on June 14th (but we'll be out of town)
Deathride on July 11
Marin Century on August 1st

What else is out there? Have you done any of these rides? Would you recommend anything in particular?