Which otterboxes are the best?

For Christmas my sister is getting my mom the iPhone 4 and I don't know which otterbox will be best for her. She doesn't really drop her phone alot & she wants a less bulky one.yk so that he phone isn't like 7in thick

My otter box:
aqua blue inner, hot pink outer
other ideas:
white inner, hot pink outer
lime green inner, royal blue outer
white inner, black outer
any color inside, gray outside
or you could have the inner and outer the same color: D hope this helps

I would go to the Apple store and ask if they still have any more free bumpers

You can buy a LifeProof case, so things are hard as hell but keep your phone looking fairly slim. However, be prepared to shell out about 80 bucks for one.
Otherwise, look for an Otterbox Impact series. It's basically just the silicon covering. No plastic like the Defender or Commuter series.