Well I will take the other point of view. IN a 9MM all it realy has going for it is a bullet that does expand, the FMJ for defensive use will indeed "kill" but in many cases it does it in a slow manor, which allows more bad stuff to contimue to happen. For ammo I was going to "set aside" I would spring for an expanding bullet, which to me is true of ANY pistol caliber! Now with that in mind, you could also look at some of the big remanufacturers like B-VAC, Black Hills, Atlanta Arms. They make JHP bullets comprable to factory fresh but at less cost. Just know what type of bullet they use and make sure it is a expanding JHP instead of a hollow point that is designed for match accuracy instead of expansion.
Depends on the purpose you are setting back, but that stated I would take a good JHP over a FMJ most times. For those others just throw a couple boxes of FMJ back as well. Now if it is for the O.S I forgot to reload for the match than the cheapest stuff that works the gun and hits the target and then a couple of boxes of JHP just in case some day you might need them or rotate your ammo.
choose brass case over steel
If match or for preps I would opt for brass. it can be reloaded, less likely to stick, less likely to break extractors, and can be sold or traded. Bottom line much easier on the gun and more reliable regardless how many rounds of steel has been used in it or by others.
Now if I had a comm block surplus then I would store a bucket full of the tuna cans of ammo because that is what is designed for but would still keep an extra extractor and spring on hand.
Now a thousand rounds can teach you how to reload and pays for itself if you purchase a single stage press and beam scale or nearly so. Haven't checked prices in a while but Lee always has their stuff on sale and I would opt up for the turrent. Be cheaper in the long run than buying store bought for your extended shooting pleasure. WSF, Unique, AA5 for protection and Tightgroup for target. Of course there are many powders that work in the 9x19, but your just in case scenario and the cost of powder points me to these powders. WSF and Unique can be used in pistol, rifle (lead) and shotgun as well as give adequate vel in pistols. Sorry got off track and like to babble.