Simon, I've been on the same hunt as you, and here's what I'm growing this year. My rooftop garden where I grow these has a San Diego-like climate though it's windy, so you should get better results than I do. I don't have extra seeds at the moment, but I will be coming down to San Diego in June and can give you plants:
P. edulis Frederick -- which is our California standard, but I find kind of boring tasting; egg-shaped purple fruits
P. edulis Black Knight -- which is a little less common, but also another Worley selection that nurseries carry and I think is the sweetest of the standard varieties; slower growing but the yield is higher for me than Frederick (probably because Frederick is too vigorous); small round purple/black fruits
P. edulis flavicarpa Sweet Lilikoi -- I got lucky and got a sweet Hawaiian lilikoi cutting from someone (the more common ones are sour, though there is a large range); the plant is vigorous and produces large yellow fruits that were as sweet as Black Knight but with a bit more aroma to them.
P. ligularis -- reported to be the best tasting species (but some say it's a bit boring because the flavor is not complex), but it's so wind sensitive it gets beaten up for me. It grows fine in our weather, and should fruit well in San Diego. Seems to like growing in partial shade with wind protection.
P. laurifolia -- my favorite passionfruit that I've ever tasted (in Hawaii), so I brought some seeds back and planted them indoors. It's now a huge vine on an indoor trellis but may not get enough direct sun every day to flower/fruit -- we'll see. Egg shaped yellow/orange fruit with leathery skin, and a perfume like aroma and low acidity. I would bet this could fruit outdoors in San Diego given a hot, wind-protected, zone 10b/11a spot in the garden. If I remember right this fruits on old growth, so it takes longer to start producing.
P. parritae x P. antioquiensis Mission Dolores -- a Carlos Rendon cross reported to produce tasty fruit, but more of a cloudforest plant (i.e. something that grows well only in San Francisco). I grew it fine with afternoon shade until we got a week of 80 degree weather and it died in a matter of days. Might do okay for you in 100% shade.
P. alata -- been growing this for a while, but also seems sensitive to wind and so the plant keeps growing and then getting beaten up on windy days, which sets it back many weeks of growth. Not sure about the fruit, but I have heard it's good.
Then there are the more recent things I'm growing this year for the first time:
P. quadrangularis -- got cuttings for this over the winter and started them; very interesting leaves / stems (huge!) but no idea about the fruit.
P. maliformis -- started seedlings of this; supposedly the fruit is good. May be too tropical to fruit here.
P. pinnatistipula -- started seedlings of this; more of a cloudforest plant. Supposedly the fruit is good, a sort of bubble gum flavor. Fruits are small.
P. edulis Panama Red -- one of the Australian varieties I'm trying out for the first time this year.
P. edulis Panama Gold -- another of the Australian varieties I'm trying out for the first time this year. (Might be P. edulis flavicarpa.)
P. edulis Misty Gem -- another one of the Australian varieties I'm trying out for the first time this year.
P. edulis Pandora -- another one of the Australian varieties I'm trying out for the first time this year. (Might be P. edulis flavicarpa)
P. ambigua -- a edible fruited passionfruit I know little about, but am trying this year.
I might be forgetting one, but in any case, I'm hoping some of these new ones (and some of the previous ones that didn't fruit yet) will be good.