On Marlincrawler.com (and i'm sure alot of other places like PBB) It tell's you the collapsed and fully extended length of the Bilstein shocks so once I get the springs under the truck i'll measure the distance between the top of the axle housing and roughly where the top of the shock hoop will be, that'll give me a rough idea as to what size i'll need. With a small lift i'd imagine they'll be 12's.. maybe 14's if I wanted to mount the top of the hoops up into the engine bay. i'll figure all that out after the new springs get mounted (one of the reason's the polls up) so i can figure out which direction i'm going.
my main objective is to keep it as low as possible without major modifications and also keep the onroad/offroad ride as comfortable as possible.