Keep the responses civil guys. 

I purchased used Custom Axis Banshee shocks and they fit perfect on the Zilla (and I believe would fit fine on the 87+ 250's).  They rode crappy until I sent them back to Custom Axis for a rebuild and respring to my specs.  Now they are pretty awesome.  If you do get aftermarket used shocks off of a Banshee, make sure you get them rebuilt and resprung for your application.  Adds a few bucks, but if your looking for a good ride, then that is your ticket.