Not sure about San Diego, but when I was in Santa Monica I visited the Izip Store and there is another electric bike speciality shop called Electric Bike Attack that recently opened. I would check them out.
Electric Bike Attack in Venice has a pretty good selection and a knowledgable staff. And it's right across the street from iZip and down the street from another ebike shop. Santa Monica has a handful, too. You could hit a lot of shops in an afternoon.