I think that way as well but it gets eroded by originality of figures. Got one of the Dark nova figures in the stash see if I can dig it out and measure it.
The Dark Nova SGT Connor is around 70mm to 80mm if I remember
Have a look at the bottom of the page in the link, where I have him standing next to a Dragon 1/35 figure
I was just thinking that the other day Pilgrim.
Scale 75 do four heads and there's one which would suit it well. Kind of a stern marine looking face.
I fancy this figure and will probably go with something like that as it will take away the comic strip look to him and make him more believable.
Karl