I went with the autozone specials in a vairable rate spring. they were cheap, and stiffened up the rear. Im running 255 60's in the back and i dont rub at all, and will be getting some 275s in the future. If you read over in the suspension section theres alot more information. theres a thread like how to make a g body handle, and theres a cheaper way to do it, and they list what springs where used. hope this helps some.
and take it easy on the small kids. lol