Crucial because of the warranty program. Twice I've called them with bad a bad DIMM and they just sent a replacement right away.

IMO, "fancy" RAM is stupid. I dabbled in it years ago. It makes no real difference, and the premium isn't near worth it. In almost all cases you are better off with more memory instead of memory with really tight timings.

The only time some kind of performance memory is really needed is if you've tricked out your machine to the absolute maximum it can go and you still want more, or you are doing some kind of unusual math. In almost any other scenario you'd be better off with a slight CPU or GPU bump over memory with tight timings.