I say we go all out with the 60x60 lol.. J/K... I can see C4 prices being inline with these, if not more... hopefully, not, but you never know...
I think we would have to get the 10x20, or something around that area.. if we got anything smaller, well... we might as well take out the "Ultimate" lol...but to be honest, I think we'll need the bigger one not only for a bigger Dio, but for the actual people involved too(set up, sitting around durring the con, stuff like that).