Chest and pants are integral components of a s/b build. Depending on your budget, it maybe better to focus on a MH first along with a shield opposed to purchasing a chest and pants. LS is mandatory on your MH since you are unable to acquire it anywhere else. LOH may not be very important after the impending RD nerf in 1.07.
Overall, if you wish DPS, inna pants are very good. If you want balance, rare pants are good. Blackthornes are good for the life%. For a chest, you will basically want either an innas or a blackthornes. In any case, gear however you wish, it all depends on your playstyle.