If you lower the car on just springs, the stock shocks will blow, that is a FACT. Now, there's quite a big number of people here that have been dropped on just springs, and their shocks are still holding up, even after 20,000 or so. Now the question is, how long will they last? That depends on the car and how it's driven. If you're not worried about how harsh the ride is, or the shocks blowing on you after xx,xxx miles, then springs is the way to go. They are cheap and you can slam the car. Skunk2 has springs that will lower your car about 2" or so.
What is also true is that, the majority of people with just springs, ends up getting coilovers, because it gives a better ride, the height can be adjusted, and they are more reliable, but they also cost a bit more money.
Goodluck!