Hi R.,
I would recommed checking out Utah's 529 plans (www.uesp.com). I chose them after I went to the MorningStar website and found that Utah was among their top five ranked plans.
Many states give tax incentives to their residents for investing in their 529 plans, however California does not. Therefore there is no benefit for choosing a CA plan over another state's (unless of course you just really like the plan).
Keep in mind that some states may offer plans that will automatically adjust how the money is invested as the child gets older (becoming more conservative the closer they get to college). If keeping close tabs on the investments and tweaking them occasionally is not something you feel comfortable with, look for a plan that will do that for you. (Utah does offer age-adjusted plans and plans that don't automatically adjust).
Anyway, I spent many, many hours researching this myself and did finally choose the Utah plan. My last piece of advice is to look at what the plan will cost you...many plans take money up front just as a fee for investing ("load funds") and then may also take a piece of what your investment makes. Try to find plans that are "no load" so that the most money possible is invested up front (or at least try to find a plan with a very small load fee). Definitely go to the MorningStar website and check out the page where they list all the states 529 plans (http://www.morningstar.com/529/529Table.html), give you their rating for each, and tell exactly what fees are associated with each one. (They break it down very nicely in terms of what a $10,000 investment will cost you over the course of 10 years for each state's plans). It can be a little overwhelming at first, but is a great resource if you have some plans already in mind...
Hopefully you can make sense out of all of this! Good luck! I know how much time it can take to really feel like you're making the best decision... (by the way, the Utah plan that I selected is already up almost 10% since we invested in February! It helps that the market tanked before we did invest, however...)
All the best!
G.