I've been using the H&R springs for a couple years now.  The ride is taunt... no doubt about it.  Overall I like the way the van drives (I come from a sportscar / autocross / boy racer background).  The only issue I have is finding shocks with enough rebound control.  I have a set of KYB GR-2's up front and Gas-adjusts in the rear and they are trying hard, but failing miserably to control the upward bounce (rebound).

  I am going to try a pair of Koni reds up front to see if dialing in more rebound helps.  Beyond that the van handles like a big fat Porsche and will be even more so with the rear sway bar installed (on my ta-do list).

  http://photos.yahoo.com/nobleman1962  for what it looks like

  Brian