10. Tech 21 Impact Snap with Leather Cover - £30/US$50
If you want some military-grade protection, this clip-on case uses shock absorbing D30 material. This has been used in armour by the US Ministry of Defence, so should give the S4 a tough, durable exterior. There's a leather flip cover to protect the screen and give access to all those vital ports and buttons.
11. Griffin Survivor with Belt Clip - US$50 (around £32)
The clue is in the name, so if you are preparing to take your smartphone out into the wilderness or have a bad track record of letting handsets slip from your grasp, this durable polycarbonate case reinforced with shock-absorbing silicone is built to brave the elements, whether it's the rainy journey home or a visit to the beach.
12. Samsung Galaxy S4 Wireless Charging Cover - £40/US$51
Samsung may have decided to opt out of wireless charging, but you can still avoid rooting around for the micro USB cable by swapping the battery cover for this handset-hugging cover. This uses inductive and electromagnetic technology, which means it can sit on an official Samsung wireless charging pad and bring your S4 back to life.
13. Proporta Barbour Quilted Collection - £40/US$55
Providing snug and stylish surroundings for your S4, the soft quilted case pays homage to the iconic British fashion line with its sleek wax jacket-style design. There's an internal slot to keep hold of cards, with a magnetic clasp to keep the smartphone secure and there's access to charging ports, the volume rocker and rear-facing camera.
14. Samsung S View - £45/US$60
Swapping places with the back cover of the S4, the official Samsung case maintains the handset's slim design and provides everyday protection for the 5-inch AMOLED display. A letterbox-style cut out will enable you to see message notifications and when calls are being received, all without having to flip open the case.
15. Speck SmartFlex View - price TBC
Primed for watching videos or Skyping hands-free in portrait or landscape mode, the SmartFlex has a retractable stand that snaps back into the flexible case once you're done. In terms of protection, it has raised edges to provide impact resistance for the screen and rubberised button covers that keep dirt out without restricting access to those all-important buttons and ports.