Dave,
I would go with the coilover kit (to get the ride height perfect), but find out what spring rates they come with (combined with what the from / to bump and rebound rates are) and I can then advise what springs to ask for to get a good ride / handling compromise. Obviously I can do you the AVOs for a similar amount to the GAZ's, but it depends which you prefer. Do NOT order the AVOs with the standard spring rates, it is horrible!

You can't go wrong with the Koni / Ahmed spring kit . BUT, you have to live with what-ever the ride height settles to and the dampers have to come off the rear to adjust them.