There are so many options in your price range for dynamics, i think you should really check out jokers thread, someone who actually has heard a handful of budget friendly phones. I could make a recommendation on one but it seems to get outdated pretty fast as new dynamics seem to come out every week. That price bracket is so competitive, i really think there won't be a huge drop off in sound quality, rather, zero in on the sound signature you prefer and other factors such as isolation, build quality, form factor, etc.
I would recommend the xears lines of phones, i have tried the xears blackwood tdIII, and apart from the driver flex, they offered an upfront mid/bassy sound, goes well with pop music. The coupon code may still work, making them at your budget if not cheaper ( check the xears thread, i forgot the coupon code ) The vsonic is one to look at as well, the vsonic gr06 can be had around 60US, and has the most impressive accessory package i have seen for phones in that price bracket, i'm not really sure what their sound sig is, but there are many ppl who already own them, im sure someone can chime in