Joint Supps

I just received a supply of Glucosamine/Chrondroitin, but I haven't had much time to formulate any opinions yet.  I'm about to put in another supp order, so I was considering getting some more for a good stock.  I did a forum search and found some positive comments.  Someone mentioned Cissus Quadrangularis as an alternative for joint relief.  

So I guess my question is... What joint supplements have you guys taken, and what produced the best results?  Squats just destroy my hips and knees.  Same with any high impact cardio.