You have the same problem as me system wise so you need to think smart, you will need to set your scene up in layers so as your camera moves along only stuff your camera can see is visable also use instances where possible, You will also need to think about not using hi res meshes but use low res with bump, normal or displacement maps. as regards using hair fine tune these as much as you can think were you need dynamices and were not (girl with pony tail does all the hair need to be dynamic or just the pony tail)...............hope this helps dave

Edit.aswering some of your question in your other post