If you did either the Bougainvillea or Mandevilla vines you could trellis them up. The butterflies and hummers love them. Also, if you put them in a pot you could bring it in over winter.
Hummers and butterflies love Sage. The Black and Blue Sage is my new favorite. But the Summer Jewel Red is a real hummingbird magnite.
For the wetter area Torenia would be perfect. Low growing so you would put it in front.
Petunias are always a great choice. They have some awesome choices! I absolutely love the Crazytunia series. Around here almost everyone puts the petunias in planters. But many of the varieties really look nice in the ground.
In the past couple years I have become a huge fan of annuals that are mostly just folliage. The Strobilanthes and Alternanthera are fun. Love love love that Raspberry Rum Alternanthera.
And finally you can't go wrong with Dahlias, Gerbers, Verbena, or Zinnia in my book. Also, if you get Geranium you can bring those in and overwinter them. Several ways to do that.
I don't think there is a whole lot there to collect seeds from. Zinnias would be one. And Petunias possibly. But most all of the commercial annuals now are hybrids. Many are sterile.
