We broke the left rear shock (OEM) Labor Day weekend. Didn't really do anything that should have broke it, but then again it could have resulted from sometime earlier!
Anyway, we bought Bilstein shocks. They immediately leveled the machine. We kept them adjusted as they were sent from Micro Touch. I find the ride is a bit stiffer now, but I also feel more secure. On sidehills it definitely feels better, and it articulates like crazy.
With these shocks, I don't think you need spacers, and they have almost infinite adjustment.