Perhaps Loren might be able to help you more...but I'm not familiar with any other surface modeling programs that are less CAD-like (only more CAD like - 3DS and Autodesk Inventor/Mechanical Desktop - both much more expensive products). Most of the 3-d tools out there are going to be aimed at on-screen rendering as opposed to solid model output. One of Rhino's target users are jewlers who take their models to solid through a 3-D output service bureau or stereolithography machine. I know that Rhino is capable of modeling your lamp, but the time investment is not small. The flip side of the 'CAD-ness' is exacting control, which is needed for the output methods (tool path generation for matrial removal techniques and 'liquid-tight' models for solid lithography or laminated object machines). Sorry I can't help more!

-Zeke