A formal/casual but not too casual or formal dress for my choir "freshman farewell"?

My choir is having a freshman/8th grade farewell, long story. We have to dress up, like you would for a junior high valentine's dance. I need a dress and an outfit to go with it. I'm not wearing heels and I need a dress under one hundred dollars that i can go into a store and try on. Pictures/link please? I'm very pale, and the colors that flatter my skin tone are red, blues, etc. I also don't like strapless dresses. I like this dress, a href="http://www.forever21.com/product.asp?catalog%5Fname=FOREVER21&category%5Fname=promo%5Fpromdresses&product%5Fid=2066194296&Page=1" rel="nofollow"http://www.forever21.com/product.asp?cat…/a should i get it, and what should i wear with it? cardigan, flats, etc.?