^ em you realize springs are around $200 or less and coilovers are $1300ish. Not budget friendly for a lot of guys and he may not be wanting to go that low and adj control arms are another $500 or so. It's a Grand Prix it won't handle like a Subaru.
Spacers..depends on what your attempting to achieve. I have no problem with a minor spacer to give your wheels a bit more poke but only recommend it if your lowering it. Are you wanting to do it on stock wheels? How much of a spacer are you thinking?
There's a great thread on spacers in the suspension section.