Well I use a few:
Mainly 3ds Max. It's the program I actually learned in, and is ideal for my needs.
Milkshape for hardpointing and any importing/exporting that Max can't do. I used Milkshape for modelling for about a week and gave up. It was painful, I'm sorry to say. It's a lovely little program, and can be used to great effect, but in my opinion Max is head and shoulders above it.
Daz 3d is installed, and I have used it for organic renders before. I'm not a big fan of it though. Mainly due to the lighting system, it feels a bit clunky at times. I'm sure that's just me being used to the Max interface though, and to be honest I've never sat down and tried to work it out.
I also have Zbrush, though I've only used it once. It's extremely powerful and excellent for organic modelling; but it does take some ability to visualise the shape before you do it. Plus the tools are like sculptors tools, and I have no experience in the area.
I've tried Blender, couldn't stand the interface. I have, though, seen it do some things that would make modelling a little easier. Still can't stand the thing, so that's a major issue.
I couldn't adjust to Lightwave either. I think it was because I was a firm Max user by the time I tried it, and was constantly comparing the two. Obviously, the fact that I had experience with Max made that the better choice.