The best brand of phone case I've owned was CLAYCO. However, I can't seem to find any case from them to match Xperia 10 VI. I've also owned a case from Otterbox Defender Series and it did not compare to Clayco.
I keep seeing Amazon reviews for "military grade" (*rolls eyes*) cases for the Xperia 10 VI but I'd really like to hear from YOU on what YOU have used and what YOU would recommend. Thanks.