Its hard to say what is the best case because it probably depends on what you like and what you need, but if I had to choose one I would go for the URBAN ARMOR GEAR Case.
Amazon.com: URBAN ARMOR GEAR Case for Samsung Galaxy S5, Ice
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About to switch to the S5 from DNA and looking for a case.
I have recently seen the Spigen Neo Hybrid. Looks like a cool case. Anyone have any experience with it?
Spigen Galaxy S5 Case Neo Hybrid | Spigen
I have the neo hybrid. I really like it. If I had to nit pick I would bring up that it turns your phone into a brick with no curvature anywhere. This makes it a little uncomfortable in the hand. Honestly the cases I have felt that had a small curvature or an extra angle on the back side didn't feel much different. Neo is the best looking case I have seen.
Also I put on a luvvitt brand glass screen protector. Fantastic product. Get one of those.