Really if you are seriously looking for a large sword-ish blade for any sort of apocalyptic situation, IMO you are better off with a humble - and relatively cheap - machete.
Swords typically are only designed to be used as weapons and don't hold up so well or perform very well for mundane survivalist use. There are exceptions of course with some of the Chinese dao type swords or the various heavy duty blades of the Philippines and India. But really... neccessary? When you can buy one of the better machetes made by Martindale, Ontario, Condor, or Tramantina... for far less money?
Machetes are relied upon as valuable survival tools and deadly weapons by people in the wildest parts of the world, every day. And the machete does indeed do well as a weapon; ask the Rwandans, Guatamalans, or Colombians. The Cubans have even used them in lieu of cavalry swords.
When civilization collapses, be it caused by zombies, asteroid impact, peak oil, or giant mutant hamsters, you would be better off carrying something which is equally effective as an everyday tool... or vicious weapon if need be. The machete will fill that role perfectly.