for ~$500, you can get a pair of unique melody mages, a custom IEM that's very comparable to JH13 and UE11s. you need to get ear molds, send them to china, and have the IEMs made, which takes about two weeks, but for a product that's almost as good as other sets that are twice as expensive, its a good deal.
but yeah, go to headfi. though in that price range, you're just stepping out of high end IEMs like the Westone 3 and Ultimate Ears Triple Fi 10s and into custom IEM territory.
also, don't get beats. over priced and low quality. the extended bass gives the impression of quality.