That's a great dress, and you picked a great site! I feel like a broken record with all the girls on here asking for dress ideas... but go vintage! Super classy, great construction and quality, and no one else will have what you do! I'll put up some links to both vintage and new dresses. (btw, vintage doesn't necessarily mean used)
And good for you that you're willing to actually pay for a nice dress. To many girls on here whine about not finding anything under $30. Come on! A nice dress is an investment! Hope you like what I find.
http://www.poshgirlvintage.com/1950s-black-gold-chiffon-cocktail-dress-p-526.html
http://www.poshgirlvintage.com/1950s-black-velvet-red-satin-evening-dress-p-693.html
http://www.neimanmarcus.com/store/catalog/prod.jhtml?itemId=prod68960010&parentId=cat9360743&masterId=cat9360733&index=30&cmCat=cat000000cat000001cat17740747cat000131cat9360733cat9360743
http://www.neimanmarcus.com/store/catalog/prod.jhtml?itemId=prod66330002&parentId=cat9360743&masterId=cat9360733&index=53&cmCat=cat000000cat000001cat17740747cat000131cat9360733cat9360743
http://www.intermixonline.com/product/sale/dresses/cate+one+shoulder+kerfluffle+dress.do?sortby=ourPicks
LOVE LOVE LOVE THIS ONE!!! I want the purple so bad!
http://www.intermixonline.com/product/sale/dresses/brigitte+satin+net+dress.do?sortby=ourPicks
http://www.intermixonline.com/product/sale/dresses/celia+silk+chiffon+halter+dress.do?sortby=ourPicks
I strongly suggest you look for more vintage. It takes more time and effort, but it is so worth it. If you want any more links to good vintage sites, let me know!