All those options are fine. It is difficult to find a perennial that will give color for a very long season. Lantana is a good choice and some dwarf types would be a good option for that area.
You might choose a perennial such as lantana and then put in a cool season annual like pansy or viola after frost (prune the lantana back to near the ground after frost) to extend the color season.
If you go with annuals you may need 3 or 4 color changes to keep the area attractive year round.
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