WLP001/1056 has been my goto yeast as well. I was trying to harvest the Pac Man from a bottle of Dead Guy until I found out that AHS carries it. The date is February 2011....nice and fresh.
I just brewed a big RIS yesterday and put it into a fermentor on a fresh yeast cake of WLP004 and a 1.5L Pac Man starter. I plan on using another fresh package of Pac Man in an American Amber tomorow which will be a propagation batch for a big Barleywine. That way, I'll have a fresh yeast cake of Pac Man plus I've got about a cup of WLP001 slurry sitting in my refridgerator that I'll probably add...not to mention that I'll have a nice amber to keg.
When I make my big beers....I try to use a fresh yeast cake and extra slurry; plenty of O2, and a steady fermentation temperature. I don't scrimp on my fermentables. Both the RIS and the Barley wine use about 21 lbs of grain
with 18 to 20 lbs of Crisp Maris Otter as the base malt.