Well your options are endless and it is only limited by your abilities to fabricate things
My first system, I used close-out hurricane channels from Lowes. You can see pictures of both of my systems clicking
http://www.solar-guppy.com/pictures.htm <- here
If you want ground mount you should stay with metal and unistrut is at all of the home supply centers, usually in the electrical supply area as are the slip nuts which is all you should need.
I have never used manufactured mounts, so I cannot offer advise on what brand is best or the value. What I have looked at seems to cost more than the panels, so This is why I built my own racks, as have others.
One SG user (Mark Lopez) built this for his sharp panels, maybe something like this will give you ideas