I usually try to have guys with 85 or higher speed ratings as my first and second hitters, provided that they have close to a .400 OBP which more often than not will keep out of dps at the top of the order, and have as many runners on base as I can for my three and for hitters who are often guys who hit doubles with some HR power.
However, if I have a very guy high OBP guy who's not too fast, I tend to hit him leadoff, with a speedy guy with some pop for hitting triples, behind him, which also keeps me out of double plays at the top of the lineup.