I'm looking for a case/bumper to protect my phone. I plan on putting on the ZAGG invisible shield to prevent the screen from shattering/scratching. I love the sleakness of the 5s, so I'd like to get to find a balance between protecting the phone and avoiding a bulky case. Right now I'm leaning towards a 'bumper' style case that leaves the back of the phone exposed, but covers the buttons and sides of the phone. Any general thoughts or specific suggestions as to what cases/bumpers I should consider?