Hi, I hate how easily my Spigen Ultra Hybrid lets in dirt and grime on the bottom ports area as well as the edges of the back of the phone (especially bad as it's see through!). The case is great if you don't mind those things. But I do, so... what are suggestions for some open-bottom cases? I know the official Apple silicone case (which feels REALLY nice in the hand) is open-bottomed, but I've heard all sorts about the material flaking quite soon after purchase. I don't want to waste £25. So any ideas? Thanks in advance!