one good free modeller app that tends to get overlooked is SoftImage XSI ModTool. They recently upgraded the free app from the 4.2 base package to version 6. It's up there with functionality of apps like Blender, but has a UI that most will find comfortable straight away. I personally like the 3dsMax apps myself, but if you are on a low budget and want a really good free modelling app, and are not too keen on Blender for whatever reason, you might want to give SoftImage XSI 6 ModTool a look. And don't let the term "modtool" fool you, its not just for XNA, and HL modding/modelling. Its a full blown modeller, with dx exporter built in.
(the built in dx exporter inverts z axis data, but I have a free util that will fix the x file. its on my dbp page (sig link))
My DBP plugins page is now hosted [href]
here[/href]