Hi , I am no expert but here is my 2Cents worth comments.

out of 4 heli , EP-8 is the most expensive machine ,of course all metal parts. I have seem a demo 3d flight of this heli and it fly very well. If you don't mind paying $150 more, I"ll go for this one. you also get a Futaba radio as well. it worths the money in the long run. of course metal is hard to break but expensive to replace..

Suprex 3d is almost exactly a copy of blackhawk 500EP. ( in china , you don't really know who is copying who ) , I fly a blackhawk 500 nitro myself, with metal head. which is I think a very good machine for its price. Spare parts from HK are very cheap. the machine is stable but I haven't try 3d on it yet.

I also watched a X-400 demo hovering from a local hobby shop in sydney, I think Superx 3d is better.

Dragonus2 , what's that....