If I were you I would turn to Blender. 3 reasons for that. It's free - keeps the poly count down compared to Zbrush - great to paint 3D models in. Unfortunately I have bought 3D content where the 3D artist has not thought at all of keeping the polygon count down. They usually get on my naughty list and I won't be buying from them again. 1800+ polys for a hole in a box is just way too much. And it has nothing to do with blocked circles or not.

There are many ways to make a hole in a box. Here's a couple:! hole.jpg

The one on the left has 224 polygons and made for subdivision. Both Daz Studio and Poser can subdivide so already there you can save on some polys and have them do the work and still be very high quality objects. The one on the right has only 128 polys but still has a nice round hole. If the object is going to be far away you can even go down to 64 or even 32 polygons. You can even split the sides and only have 1 polygon per side to further optimize.

There are many ways to optimize an object. Just need to think what the object is for and can the polygon count be justified.