I try to follow sequences, lining up my order based on repitching yeast and what I happen to have on hand (buying in bulk and establishing preferred strains helps this), how long things need to age (I try to switch it up between high gravities needing aging time, and session and normal gravity beers), keeping the beers I brew well and brew often (my Ordinary Bitter, my Mild, my ESB, etc) around as much as I can, rebrewing something else when I feel like it, and otherwise brewing a style I enjoy (there are very few styles that I don't enjoy) that I've never brewed before.