For what it's worth, here are my main sculpting tools:
A Citadel standard metal sculpting tool, a pointy metal stick thingy, an exacto knife, a set of size 0 extra-firm clayshapers( flat chisel, angle chisel, taper point and cup chisel),
rounded ball tip stylus and my fingers.
Citadel standard sculpting tool: used for spreading green stuff onto things and general shaping. It has two ends but I've only used the one shown in the pic.
Pointy metal tool(what are these things called?): used for marking guidelines, scultping small details like faces (particularly the eyes) and creases.
Exacto knife: used a lot like the standard sculpting tool to spread green stuff over an area and to create flat areas. Also handy for cutting and trimming green stuff
Size 0 EX-Firm Clayshapers are generally used for smoothing layers of green stuff. I highly recommend picking up a set if you are going to be working a lot with green stuff
Flat chisel is used for smoothing areas,
Angle chisel is used for smoothing creases and small sharp crevices. I rarely use this tool.
Taper Point has a rounded point and used for smoothing out rounded areas.
Cup chisel is used for pressing on new layers of green stuff and spreading it out to where I want it to go like the standard metal sculpting tool. This one, along with the standard sculpting tool, is used to create the general mass and shape.
Rounded ball tip stylus is used for making rounded indentations in the sculpt like eye sockets for skulls. Not used very often but handy to have around when you need it.
Of course the most often used tool for smoothing and creating general shape is my finger tips
, any chance you'd consider thinking about some female termi's? Thinking of making an ally grey knight "counts as" more elite sisters, using your female marine legs and bodies with grey knight force weapons for strike squads and was considering grabbing the tartarus pattern forge world termy bodies for the termy ladies, however if you're thinking of doing termis i might hold off with the latter 
