I'm going to second (or third) the recommendation for two packets of US-05. It's a great, clean, high attenuation yeast that will be perfect for this style. You could probably get by with a single pack, but for an extra $1.50 use two (you won't be overpitching).
I really can't see using liquid yeast on a beer like this; from my experience, as well as that of lots and lots of other brewers around here, the US-05 is just as good a yeast as the Cali Ale yeast. Save the liquids for when you really need the yeast to add a particular character (hefes, Belgians), not when you just need clean fermentation.