http://www.pelicanparts.com/ultimate/Forum21/HTML/000019.html
Here is the other post. Stay away from the Autopower cage it is cheap to buy, but it is also just plain cheap...
A decent welded cage is always better than a bolt in cage. It adds to chassis rigidity and protects better. Also if you are not doing the labor yourself they are roughly the same cost. Stay with cold rolled steel (mild steel/DOM tubing whatever you wnat to call it) Chrome moly is hard to work with, and if not welded properly will crack.