Best Grasses for screening?

Hi everyone, just wondering what are the best tall grasses for screening and structure that would what work well with Rudbeckia herbstsonne? I don't need huge amounts of screening,just want to screen off a small seating area. I was thinking of using buddleja Santana but the 3 plants I have are tiny, and so it will be a couple of years before they come into their own.
I bought a golden stem bamboo, then realised its doesn't like full sun.So that's gone somewhere else.
Please help, my pocket (as well as my head) is hurting and I cannot afford to make any more mistakes.
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you beat me to it Ceres, How tall do you need them to be?
Thanks, I need them to be around 6 ft minimum but 8ft would be ideal.
Oooh, just googling all the grasses mentioned and Calamagrostis 'Karl Foerster' is a lovely looking grass.
Miscanthus sacchariflorus might do the trick.
Thanks Hosta, I take a look.
Thanks Verdun,they are gorgeous. This is from the Telegraph....
"The bluer-toned leaves of 'Heavy Metal' can be used with tall yellow daisies (such as Rudbeckia laciniata 'Herbstonne')"
Decisions, decisions. Typical novice gardener, I want them all!
Thanks for all your help, decided to go with Ceres suggestion and chose Miscanthus sinensis 'Silberfeder', to match the height of my 8ft rudbeckia.

Absolutely thrilled to find my local nursery had some really big ones in 5 litres pots at just 7.99 a throw! One very happy chicky. Cannot wait for the rain to stop to get them planted up!
Thanks again for all the wonderful suggestions, I am now even thinking about grasses for the front of the new bed too.