I'd disagree with Modo a bit. Its nice, but you have the same tools and functionality in both Silo and Hexagon. The only advantage would be that you get a 201 upgrade for free and would then get the renderer and texturing capabilities. I'd say if you have Hexagon then use it, it has all the necessary tools to model. And there always will be a program that has more features that you think you'll need. Though if you do have the finances and need a rendering and texturing program then Modo is a nice deal.