Based on its earlier Slim Armor case, Spigen SGP has introduced Tough Armor for iPhone 5 ($30). At its core, the basic structure is the same: a silicone rubber body reinforced with a plastic backplate. There are both obvious and subtle differences. The case is just a bit thicker, with redesigned Sleep/Wake and volume buttons, plus full openings over the speaker and microphone. Unfortunately, there's an unsightly hole over the Apple logo now, exposing…
