I am a little biased, but Winter Invitational is a great meet. Good meet location, very well run, one of the yummiest teriyaki chicken bowls ever at their snack bar, close to SFO for flights and very good competition as most of the top NorCal gyms attend.
Golden State Classic at Technique is another great meet, but it's in early January next year I believe. It's a great meet to start at for optionals though because the vault is very forgiving.
Spirit of the Flame used to be the biggest NorCal meet in February, but due to changes up there it is no longer worth attending in my opinion.