Any fast race oriented Sat/Sun Group Rides in Bay Area?

The Fremont Freewheelers website has a fairly extensive list of regular group training rides on can join in the Bay Area:

http://www.fremontfreewheelers.org/RaceTeam/Useful/TrainingRides/ByName....

My question for this forum: Does anyone know if any of these rides is actually consistently fast or attracts higher level racers who may not be racing that weekend? I live in the East Bay, but once or twice a month, I would be willing to drive to another ride if the pace and level of riders was higher than my local group ride I join on the weekend. What I am looking for is to train with some better 1/2 pros or top level 35+ guys.

I know many top notch racers seem to train alone or just with select friends or teammates and/or they ride their program and don't push hard, but there's got to be some regular group rides that really are more challenging than the usual slack pace with the occasional sprint. Anything like this in Marin, North Bay or the Peninsula which is open to guest riders and meets consistently?

Thanks!

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