I have a friend who has grown the New Millennium and swears by them. Seeds are available from their site in NZ, but a bit on the pricey side.
I grew Magic Fountain from seed last year, and got a few blooms first year from small plants - they came back gangbusters this year, and while they are supposed to be "dwarf" a few are over 6 ft. I am loving them. I started more this year, because the first year ones looked so promising, and I am glad I did. Next year I will have dozens.
We did have a thunderstorm a few days ago that broke a few of the largest branches, and knocked a few others sideways, but they still look good.
These are getting about 6 hours of sun a day. We haven't had any heat over 85 yet this year, and had a coolish summer last year, so I don't know how they would hold up to a month of 90's