It does look cool all slammed like that.
If you need to drive it around and use it as a somewhat practical everyday car, I recommend replacing everything in the suspension that is worn out, and replacing the springs with a good quality set of lowering springs from possibly one of the vendors mentioned earlier.
I don't think that you will be happy with a low quality coil-over kit...
Once you get the car raised up, the suspension geometry will be closer to where it was originally designed to work correctly. This will improve the driving and ride quality tremendously.