Monarda's are not the most attractive of plants. I have 'Mohawk' which is a strong grower with the cutest of scruffy looking flower heads, it comes back year after year, I love it!! Heleniums are just a great all rounder, all of them attractive and long flowering, no garden should be without them.
I also love my monardas. I have 'Beauty of Cobham' which is a lovely pink. Not had a problem with mildew - yet - and it doesn't run all over the place
If you click on this link and scroll down you'll discover some mildew resistent varieties http://www.specialperennials.com/Other_Perennials/Plant_List_Monarda.htm
I lost one Monarda last year to mildew (but I'm fairly sure it had it when I put it in, just not noticably) this year another one went in the bin, but I put that down to the exceptionally wet weather we've had.
One type has romped away (Jacob Cline on Dove's link) and seemed to love the wet weather.
A true beauty is CAMBRIDGE SCARLET, Try growing this alongside Campanula lactiflora. Both flower at the same time, and are the same height. Stunning!