If Speck's SmartFlex for iPhone 5 looks familiar, that's because it's essentially the same thing as PixelSkin HD. The all-rubber case includes volume and Sleep/Wake button coverage, and dedicate holes along the bottom for the Lightning and headphone ports. One big difference is that instead of the "pixels" -- the raised squares on the back -- running in in straight rows and columns, they're positioned diagonally, and tilted slightly to create…
