T-Gal,
You have a good start; in what you are thinking of
One plant I recommend for SPRING blooming is "Candy Tuft", they are pure white and get around maybe 15 - 20" high - and a nice compact bushy flower. They are a beautiful white and look especially nice on an overcast day, these along with daffodils and tulips would be beautiful. Also, Irises would be good, but they are not long bloomers.
Of course, Black eyed Susans are great and bloom long; and also the "White coneflowers" - have you tried these?? These are nice also and tend to bloom a bit later(depending on how hot the summers have been) - and I love the Shasta Daisies also. They have one called "Crazy Daisies", have you seen this one? Same order of the Shasta Daisy, but a bit more of a ruffled look. These bloom quite long.
I also have planted the Dahlias from Bulbs this spring. First time I ever did this. I was leary at first, but was pleasantly surprised. I only planted bulbs (which you HAVE TO DIG UP IN THE FALL) but They grew into these huge 4' sturdy plants with flowers about 6" in diameter. Something you may want to try; and a very long blooming time.
Another thing you may want to try is the "Balloon Flower" They are purple and look like balloons before they open up - you can get them in a 15" height or up to 30" - the taller ones may need staking depending if you have them in a windy area.
Also another good one is called Phlox(King David) - they get around 2' to 3' tall - pretty white plant with a large flower head(a perennial) and they do not tend to get the Mildew on their leafs like some Phlox do.
Russian Sage(purple) is very pretty also, about 3' tall and sturdy and a long bloomer. I wll try and take a picture today and post it for you.
Also, remember the Cleoma/aka Spider Plant is an annual, not a perennial. I planted mine in April and they grew quickly and are still blooming, but they also have prickers, so you need to be careful when digging them out in the fall .But they are beautiful and get huge and I think with your warm climate, they should get close to 4' tall.
Don't know if you have Lupines around there, but the miniature ones are great - about 24" tall with a flower length of about 12" long, interesting and beautiful; stay away from the tall ones, as you will need to stake them especially after a heavy rain.
Anyway, those are some of my suggestions.All these plants I mentioned really do not need any special care, just water and some fertlizer maybe every 2 weeks. We have clay soil here which I hate. I have added some good soil in with it, but the clay seems to keep migrating upward; but the plants have done well in it; so if you have good soil to start with; with good drainage; they will do even better. I am sure I can come up with others; it's just early a.m.