I use Hexagon, which Ive been very pleased with. If I were going to choose a modelling program again, Id probably take a closer look at Silo. They have similar features and a similar price. Both have free demos you can try. Silo is a little cheaper and is also supposed to be a bit more powerful. The big advantage these have over programs like 3D Studio Max, Maya, Lightwave etc is that they only do modelling (no rendering, animation, shading etc) so they are much cheaper and have interfaces that are much easier to learn, since they arent cluttered up with tools you dont need to use. The free modelling program, Wings3D, is very popular too.

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