Eventually, lowering springs will blow out your stock shocks. If you just go springs now, I'd figure that by the time your shocks go, there will be more coilover options available. That's what I'm assuming at least. I have had two cars so far that I've ran springs only. On my Cobalt SS, I ran Sportlines with stock shocks first. Then upgraded to Koni's with Pedders a year later. On my Si, I ran Skunk2 springs. I planned on getting coils around this time, but ended up selling it. lol