Ok, I finally had a chance to get the Bilsteins on. And the verdict is... The ride is absolutely FANTASTIC !! The VX feels like a BMW M5 with them on. Very little roll, very good road feedback. If you're going for street performance, these are definitely the way to go. I haven't had a chance to test them out on rougher terrain yet, but I'll update you guys once I do. Again, the setup is:

Front: 1738-H1
Rear: 1739-H1

H1's are about 25-30% stiffer than H2's up front.

While changing out the rear shocks, I had a little bit of a revelation. I was looking at the extreme angle of attack that they are mounted at, and thought that this could very well be the reason they go so quickly. They're mounted at an angle about 30 degrees off vertical. This means that they endure about 150% of the load that they would if they were mounted vertically. I don't really see why Isuzu set them up the way they did (they're not even mounted directly to the frame rails). Anyhow, food for thought.