Well, DF is really nice stuff, but it does get expensive. A lot more so than the Hirst stuff.
It really depends on what your needs are, I like being able to make as much as I want, and sell it off if need be. To get the 4 basic cave molds you are looking at $130 or so. Which is a lot, but then, you can make as much as you'll ever need.
Anyways, thanks for the compliments.