I'm killing 2 birds with one stone here

http://pixologic.com/zbrush/system/

http://store.wacom.com/us/intuos
intuos 5's Medium or larger

http://store.wacom.com/us/cintiq
Any of the contiq will do

http://pixologic.com/zbrush/features/HDGeometry/
zBrush will go as high as a Billion ,in zBrush.

For VectorMaps don't know how high diffrent CGI Artist ,Studios and App's use.
But if I was making a Vector ,will Displacement Map for Poser probably would not go to a Million.

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In the world of CGI zBrush is mostly just used for Textures in Games & Vector Map Textures for SubDed Meshes.

For games to make the textures A lot scuplt a high polycount mesh in zBrush
send the mesh to 3DCoat or a app like 3DCoat retopology n burn the texture for the low polycount game mesh.
So the zBrush mesh gets thrown away n never used.

For SubDed meshes they get modeled in app's like C4D,Max then GoZ to zBrush
Rase the polycount sclupt the Vector Maps.

If you go threw all that just for a texture ,nothing more then a texture.
I would say you have made ever effort to do the best you can.

How many make every effort to do the best they can ?

If one makes every effort and another does not
,what would you exspect the one that did responce to be to the one that did not ?

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance