Nevertheless I'd like to bring to your attention the arrival of a brand new sculpting material called BeeSPutty that is available since yesterday.
BeeSPutty is a one-component bake-able sculpting putty. The guy who develloped this putty is Stefan Niehues, a professional sculptor who has quite a lot experience in all kind of sculpting, especially sculpting miniatures.
As BeeSPutty is a a bake-able putty, it is similar to Fimo and super sculpey in some ways, but it has some unique features. Just to mention one, you don't need a greenstuff foundation on a wire armature if you want to sculpt miniatures with BeeSPutty. And you can sculpt 30mm miniatures as well as larger things like busts etc.
Fimo and SS firm grey are not bad, but as far as I've tested it, BeeSPutty is even better. It has quite a wax-like-feeling and you can get sharp edges quite easily with this putty that also blend perfectly. I just have to go on with my testing, but it is very promising.
So if you want to know more about this putty, head over to www.masqmini.com where you will find more informations and also some videos about sculpting with BeeSPutty. There you can also order the putty.