i like BLENDER!
but you are right- it can drive you batty if you let it.
i can tell you why i choose blender though.
it is a one stop shop.
as far as modeling goes- i can model something in blender and export a
shapeways ready model straight away. no fuss no muss straight away. but i
also like that i can do all of the other artsy stuff that i want in
blender too without paying out the nose. for instance i use Max at work
and there is a lot of cross over what you can do on each program but at
home i do not have the couple of grand it takes to get a license...
blender is the closest that i have found that will do the job.
i have also used Lightwave and Autocad in my 3d exploits and in limited
amounts Catia, Unagraphics and Deep Exploration and all of the programs
have one thing in common- they are expensive...
i did look at 123d and that seems to have a huge upside and could potentially be exactly what you are asking for.
i have never seen groboto but it looks very cool indeed.