Thinking about it, it would be interesting to see how many percent of the HTL models in Freespace 2 were made on Blender, I think people would be surprised at how high it is 
I'm not certain, but I *think* Raven2001 might have used Blender to produce either the Hecate and/or the Ravana too.
BTW, Blender can do animations very well, but I've not yet looked deeply into that aspect. I do plan to when we start work propper on TI cutscenes though.

Oh and you can't even USE blender for halo pc modding. You need gmax because that's the only one that supports an export to halo tag function.
I'm pretty sure Gmax can import meshes from other programs. In that way, you could quite easily use Blender for Halo modeling/UVing/texturing, and then just use gmax to convert it in much the same way that the Blender users around here usually perform the final conversion in TS.
This is no longer the case anymore - Water has modified Blenders COB exporter to be able to save convertable COB files.
HereAnyway, as to the topic, I've never tried Wings3d, but I've heard and seen good things about it. Gmax should be there too, and another option is SketchUp. Unknown Target found a way to get a SketchUp model into FS, though you'd need to ask him (or find his post) regarding the details.
I generally dislike Truespace for a huge range of reasons (having used it alongside Blender for years now), but the free version - 3.2 is practically unusable. I would strongly advise against anyone using that for anything other than hierarchy or getting primitive objects in-game.