This is all my experienced opinion, but:
best inexpensive shock for explorer= Gabriel VST
best hi-line shock for explorer= Bilstein
I have experience with VSTs on Explorers and they were good shocks for the money...well let me put it this way, the $30 Gabriels could hang with the $70 Edelbrocks any day of the week.
As you can see by my sig I currently have Edelbrocks, and they are ok, but imo not worth their expensive price tag. One of my Ed's had a leaky O-ring within a week of installing, and I see by reading this thread I am not the only person to have to warranty out an Edelbrock shock. Seems like if you are paying $60-70 a shock, quality problems should be rare rare. But I will say this, Edelbrock gave me no problems and sent me a replacement FAST.
Still, next time around I will probably buy a set of Bil's.