I've heard good things about Bam cases. I have a Protec case for my flute and piccolo and I love it so much I'm buying one for my oboe. It's got a hardshell inner part with the nylon outer. It's up to personal preference, but I really recommend any case that has either an outer part with a zipper or something with a latch that locks down. I remember having a flute in a regular case spilling onto the concrete because the flat latch came open. Horrible experience.
speaking of instruments getting run over...this one guy in bands trombone got run over by a fedex truck. fedex was really nice tho (cuz it WAS THEIR fault-not the guys) and they bought him a new, better trombone. i doubt the case your looking for will be going thru that, but it still pays to get a good sturdy one that your instrument wont fall out of!
PS i have a bam trekking and love it. i would definitely recommend it.