What do you all suggest for iphone 4 bumpers? I bought the incase (half transparent) one from Apple since it was high-rated on the store for around $30. While it looks awesome, it's starting to crack on the edges after only a couple monhts. Worried I might need to get a new one, but dont want to 1) waste money and 2) get something that makes the phone look clunky. Any suggestions on bumpers that last but also look good?