well, let me ask you this: do you have a general plan on what lift is going on? do you plan on replacing the wheels at some point? and what size tire are you planning to run after the lift is put on?
usually, spacers are relatively safe as long as you don't stack spacers (garunteed breakage!), and have the lug bolts torqued to spec.
another site to check out is Rigged Up
. they have spacers that range from 1" to 2". they are about another $10-20 more than some other brands out there, but they are a quality product.