In addition to others, I like Omomuki for its early bloom. The garden was so fresh then and we didn't have this terrible heat. While others long for lates, the last few years, the late garden has been especially hot and dry. I especially enjoy early midseason cultivars.
For later bloom, you can't beat Stone Beacon as a landscape plant. Good height, well scaped, big flowers, bright but not harsh, vigorous. Only drawback is that you have to have room for a rather large plant.