Need certain case for Iphone

Firstly, I know there are millions of threads on here already with very similar subjects, so sorry in advance

I will be getting an I Phone in the next few days, and am in the market for a case for it. I currently have a invisible shield for my Ipod touch, and do like it, although it has started to peel a bit at the edges

Basically, I'm after a case which does not increase the overall size of the phone too much, and still keeps look and size of the phone as close to identical as possible.

So far, I've looked at the invisible shield and the Griffin Reveal, and have heard good and bad comments on both.

If anyone has any further cases to look at, and/or comments on them, it would be greatly appreciated.

Thanks