I have a polariser, grads - ND2, 123L, 125L, 664, 667, soft spot - 225 stars - 056 and 057. To be honest the only ones I've used in the last ten years(ish)  are the polariser, the ND2 and the 667. The ND2 and 667 have only been used when using B&W film. 

All the other effects I started to apply in photoshop as soon as I got my first copy (version 3 IIRC) and slowly I stopped using the filters. It was ages before I got a decent home printer, but work had a fantastic colour canon laser which ten years ago cost something like £30k.....

Now with the digital camera I pretty much only use the polariser, reading this thread I wonder if I should find the old camera bag and have a play.

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.