Take a look at Thomson Grass Valley's Turbo iDDR. It will handle SD and HD.
http://professional.grassvalley.com/products/turbo/
You might be able to rent the Turbo or other DDR from your local staging company if this is a one time event. If it's an ongoing program you should get a demo and see what you think. The cost is about the same as you would pa for a low end Betacam deck - about 10K used or 13 - 15K new.
Although this sounds like a sales pitch I don't work for GVG. Our company does use their K2 file servers as well as a Turbo unit. A clip server (DDR) is a good solution when the situation calls for playing out many clips & formats. If the Grass unit doesn't fit your needs or budget have a look at the other DDR's out there: Abekas Clipstore, Drastic Technologies, Digital Rapids, RaveHD, BUGtv (Mac based), AVstumfl and others.
