I go the simple route too. I've save squash, bell peppers (various colors), and green bush bean seeds. I keep them sealed up in an envelope and keep them down in the basement pantry. It is cool and dry down there. Seems to work for me.
I've not purchased one of those seed survival buckets. I think they're a great idea, but as I looked at what was in them, I personally wasn't interested in some of the seeds in there. My veggie garden is a simple one. I have limited space, so I try to stick to what I know will produce well in my particular area.