I narrowed my search down between the Seidio and the Nutshell. I eventually went with the Seidio for a host of reasons dissimilar from yours. I have had the Seidio now for almost two months and couldn't be happier.

However, given your criteria, I would definitely not recommend the Seidio and would instead heartily recommend the Nutshell, provided you could overlook your aversion to leather. Even though I have never tried it, from all accounts, the clip model with flap would fit your criteria perfectly (except, of course, it is leather).

Happy hunting.

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