Yes, sketchup is a good option. It´s a bit complex if you try to build organics or not so hard surfaces, but you can do it. Sketchup has a dedicated community, which produces LOTS of plugins for free. Oh, and after done, you can share the model and open it in other pc without to need the plugin.
I´m a max user but, just for curiosity, I played with sketchup. I built a mesh (a starship) in just one week, without any manual, just based upon try and error to see how intuitive the application is. And it´s a fact.