I need to buy a big new suitcase for longhaul trips. Am unsure if it's best to buy expensive (thinking it will last longer), or cheap (baggage handlers are notoriously rough on cases so do I really want to let them maul something nice?). Also wonder if it's best to buy soft-sided or hard molded from a durability/weight standpoint. Finally - any suggestions about where to look/purchase would be helpful. Thanks.