Other people have already posted my fav brands with this look/price range. I would definitely look at Marc by Marc Jacobs. I think he is the best for young/hip bags that aren't so super trendy that you can't carry it after a month. shopbop.com and zappos.com have a great selection of his bags.
I was going to suggest Marc by Marc Jacobs. These are his more 'youthful' bags that have fun patterns and colors. Most of them are in your price range too.