I had PowerSupport on my 4 (front and back). Right now, I have an SGP on the front. I was pondering the SPG full body protector, but the different choices confused me
I put SGP Ultra Optics on my 4S last year and it came with a back protector. I've been very happy with it so I am waiting for SGP to release it for the 5. Hope it includes the back protector again.
What I did for the iPad is I covered any openings where water could go in with tape prior to installation. I find wet installation so easier than dry installation.
I just used Skinomi cause it was $4 on Amazon and it went on great. Just like Zagg but a tenth of the price. It was a wet instal but you only need a little bit of liquid cause iPhone 5 is a flat surface. Just align and you are ready to go.