Does anyone know any good geo modelling software and the rough...

Does anyone know any good geo modelling software and the rough prices?
Looking for something that I can plug drill results into and get a rough idea of the shape of a deposit and maybe some isosurfaces.
Some Krigging capabilities would be nice, but not a
real requirement.

Had a look at Ctech and Leapfrog, but they seem to have fairly chunky maintenance costs.

I really dont want to but if there is nothing out there that doesnt cost a bundle might have to code something in OpenGL/C++ or Java - yuck.