I second Rozanne, it's very good, mine is still flowering its socks off.
Yes to dwarf asters, I have a few. It's raining now, so I shall only look at the nearest bed.
Chrysanthemum Mei Kyo, pink, 18-23".
Cuphea hyssopifolia, pink flowers, also known as 'fake 'heather', it's maybe 8" high and full of flower right now.
I can't find the aster label, the birds must have stolen it, as usual. There is also another late geranium that looks just like Rozanne, Brookside, that bridges he gap perfectly between early geraniums (many finish in July) and Rozanne. Rozanne doesn't flower until very late in August, so but Brookside as well to extend the season.
I would buy smaller lavenders and loads of pinks with strong clove scents, but be careful, lots of them aren't as scented. Another plant that looks lovely with roses, pinks and lavenders is linaria. Herbs with scented leaves are also lovely, such as sage, especially the purple-leaved one. Rosamary, thyme, and there are loads of salvias to choose from, not just the edible forms. Salvia x jamensis varieties are available is soft colours, I have a few of those and they are very hardy.