I've got a Wilber's Shock on the rear, with progressive springs and a SJ cast fork brace on the front end of my '92 GSPD. Can't remember what weight oil I used...
The whole package works well for me. I found the SJ brace took a lot of the squirm out of the front end, especially when that big ass gas tank is topped off. Mind you I am a good 220lbs before I put my kit on so I'm putting the system under stress just riding around.