I have Indian summer and that is well behaved and about 18 - 24" tall .

avoid Orange King it is a thug.

Another vote for 'Indian Summer'. I also have a bright orange one that came in a packet that has spread like wildfire! It was supposed to be red, so beware labelling....

The website which advertises them is a bit dodgy so take care where you buy them.

Indian Summer is part of the ‘Summer Paradise’ series. So it may be worth looking at others in the series. My Indian summer grew very big, very fast. I reached about 4’ wide by about 3’ high but after that it has reduced in vigour and in flowering every year. I was, in the end, a little disappointed to be honest. My other very tall yellow one, which my Mum gave me, was a beauty. It was spreading gently. I bought six more dwarf ones from a specialist nursery, but none of them came back in the second year. So make sure you really get hardy ones!