Recently, I spent a week in La Paz with House of Scuba folks and genuinely enjoyed my time with them. If I wanted a dive guide for the La Jolla area, I wouldn't hesitate to go through them.
House of Scuba is a well-stocked dive shop with a sizable inventory. If you're looking for a dive product that's not in their storefront, they simply direct you to an in-store computer terminal to look at their website. The shop has a huge, attached warehouse and staff members will pull the items you want to look at and bring the items to the storefront.
-AZTinman
---------- Post added November 12th, 2014 at 10:53 PM ----------
Oh, I forgot to mention the Power Scuba folks. Power Scuba is a very active non-profit dive club in the San Diego area. Membership is open to anyone. The club organizes dives at La Jolla Shores on a regular basis. You might want to consider joining the club. It may have Ja Jolla dives scheduled for the time you'll be in San Diego.
-AZTinman