These are some of my favourites:
Leucanthemum and Gypsophila paniculata ‘Pink Fairy’ Rubeckia Cherry Brandy and Nigella damasca Dahlia Rebecca’s World Lavender, Antirrhinum and Gaura lindheimeri The Bride Allium sphaerocephalon Dahlia Hy-Trio
Check out the RHS guide to growing dahlias.