I've used Gas-A-Justs successfully in the past. They do have a lot of gas pressure in them. Do not cut the plastic retainer strap until you have the things bolted in or you will have a helluva time forcing them into place. That said, I noticed that they actually lifted the car maybe half an inch. Never noticed if they settled down later.
Don't waste your money on GR-2s. They are premium-priced 'eh' shocks. If your wallet prescribes 'eh', go with Monroes or something else less expensive.
On the other hand, I had Bilsteins (OEM) on the Bravada. I replaced them with GAJs and the ride is about the same as the 85K used Blisteins. My butt dyno tells me that the Bilsteins provided a crisper ride. You get what you pay for.
If anyone can enlighten me on Bilstein part numbers for 'short' shocks appropriate for a 2-3" drop, I would appreciate it. I have a wagon and I will need more damping when I bring the ground up close to the Flowmasters!