Photography Cube Light

which photography light box would you recommend?
im looking into buying a lightbox after alot of people saying i could do with one soooo im asking for advice on which you think works best ? im using it with a white background to take pictures of sterling silver jewellery.
1. the cocoon type
2.the open fronted (just looks like a box on its side)
3.the foldable cube type
I build my own light tent.
I got the basic idea from here, but I modified it to be more versatile and easily transported to a location if need be.
http://www.pbase.com/wlhuber/light_box_light_tent
I built this one for less than $10 and didn't have to cut anything. The guy at home depot cut all the pieces to the size I wanted.
How to fold a lighting cube