Graphic Card for printable objects

Am using Blender to create objects for print, meaning I have meshes with lots and lots of polygons that have to be moved, displaced etc, and don’t have to render at all. I have reached the limit for my current card (Quadro 600) and would lie to upgrade. I am on windows 7, 64 bit.

Can anyone make suggestions? I would like to spend between 250 to 500 Euros.

Thanks,
Graham