Gabriel VST. If they still make them. Keep in mind, for $25-30 each, you're not going to be able to buy a very stiff shock.
Bilsteins are tighter, but they cost more. Edelbrocks are tighter, but they cost more and are pieces of junk. You might look at a Rancho 5000 series shock, if they still make them--they are Rancho's budget shock and they might be what you're looking for, but I think they cost a little more that 25-30 per shock.