what do you think about this head for a sig fig?
http://www.bricklink.com/catalogItemPic.asp?P=3626cpb1070
or one of these:
http://www.bricklink.com/catalogItemPic.asp?P=3626bpa1
http://www.bricklink.com/catalogItemPic.asp?P=3626bpb468
http://www.bricklink.com/catalogItemPic.asp?P=3626bpb404
http://www.bricklink.com/catalogItemPic.asp?P=3626bpb585
http://www.bricklink.com/catalogItemPic.asp?P=3626cpb1118
http://www.bricklink.com/catalogItemPic.asp?P=3626cpb876
http://www.bricklink.com/catalogItemPic.asp?P=3626cpx14