Start with a good set of shocks. That's what we did with our P30-based moho, and it made a tremendous difference. Do go with high quality shocks, either Bilsteins or Konis. One shock at each wheel; one for steering stabilizer.
We went with Bilsteins from shockwarehouse.com; I noticed a few weeks ago that Camping World carries both brands, too. Installing by yourself is not hard with moderate tools. It helps to use a shock squeezing tool to keep them "short" while doing the install; I used a simple and cheap long furniture clamp for the purpose.
:)
Lynn