Not sure about this, but I think you need to be drysuit certified to rent a drysuit; so it may not be as simple as just renting one (unless of course A, I'm wrong or B you're drysuit certified). Water's starting to get pretty chilly so a drysuit would be best...but having said that, I dive wet year round with similar thermal protection to what you're using and it's definitely adequate; although after 2 or 3 dives you'll be seriously wanting a hot shower. Also, for shore diving, I'd give some serious consideration to diving in Laguna...overall I'd say you get better diving in Laguna, plus conditions are more consistently divable than San Diego.