There are lots of wonderful choices for your Zone 6 shoreline garden, below. You might also check with your County Extension Service for their list of plants suitable for your climate.
Melica aff. ciliata (Melic grass)
Calamagrostis acutiflora 'Karl Foerster'
Schizachyrium scoparium 'Blaze' (Little bluestem)
Perennials to go with the grasses:
Artemisia versicolor 'Sea Foam' (Curlicue sage)
Erigeron linearis (Fleabane)
Santolina (Lavender cotton)
Buddleia davidii (Butterfly bush)
Agastache sp. (Hummingbird mint)
Rhus aromatica (Fragrant sumac)
Spiraea japonica (this is a small shrub)
Perovskia atriplicifolia (Russian sage)
--Stephanie Hainsfurther, Albuquerque, New Mexico (formerly of Connecticut)