This year has been a year for golden oldie saxifraga London Pride and a little old Stone Crop which is going for world domination. Both have been covered in flying things for months and spread to blanket proportions. My prediction for next year is Erigeron because everybody says so.
I've just put in two in the community garden, on the basis of your glowing reports @Nollie - I aim to keep them fairly small and low. They are planted into sand, essentially - full, all day sun. They are doing well so far.
Geranium Azure Rush is another star. Flowers for months and months, and the leaves have lovely reddish patches as autumn progresses. It is not keen on afternoon sun though.
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My prediction for next year is Erigeron because everybody says so.