My fave combination: MarbleCLAY (free, fairly stable beta): http://homepage3.nifty.com/escargot/ I use this for initial modeling, because I can create a new polygon/polyline anywhere I want. The one thing to beware of is that you need to change the axis orientation for import/export so that the lower left says X+, and also check "flip facet". Wings3d (free, very stable beta): http://www.wings3d.com I then bring the model into Wings to tweak and add detail. There is one additional thing to be aware of in both programs, and that is to set import scaling to [50] and export scaling to [0.02]. Both apps have the ability to create UV mapping, each with their own approach. This is an especially powerful combo if you want to create clothing for Poser characters (conforming or dynamic).