While I am these late months much more focused in illustration gigs, I have modeled and animated as a job during many years. I used to use both Wings3D and 3ds Max at the jobs, at the companies. 3DS Max as was totally required to even be contracted. I usually always had a chance of convincing them to allow me to use Wings3D for all modeling, and then import into Max, specially non hi res models.
Now as a freelancer, I use: Blender, specially for 3D printing stuff as touching in two settings it gives you the accurate dimensions and etc, but also as it's a really full complete 3D package. I still can't get used to model daily with it, but mostly as I have "bad habits": Learnt "too deeply" another modeler, am more of a Wings3D modeler since many years, but any modeling can be done with Blender, is really flexible. I mostly use it to animate, edit, fix, and of course, render, with Blender Cycles and with Blender internal render.
If you liked Sketchup, you will probably like Wings3d. But about Blender, for a package that is hugely community supported, very complete, very promising, (and improved in the friendly UI department quite a bit) I'd recommend Blender all the way. Plus, open source like this, being kind of a flagship of it all, and so vastly supported everywhere, is a safe bet, IMO. There are bazillions of video tutorials in Vimeo, Youtube, etc, or to go the super cool way, among the best of the best resources (videos, books, etc) are in Blender.org shop.
They practically support every need in 3D, so, if you learn it, you can transfer the knowledge to other packages later on, just like with any complete 3D package. (in case you would ever need that for whatever the reason (a job, etc))
I recommend it not because is free, but because it is good and ...free. Both softwares.
Also, is great that certain little thing for hi res detailing, Sculptris. You can do this also inside Blender, but I kind of like specialized tools, too.
Edit: Forgot...! For fixing, Netfabb Basic, or if prefer a tool usable in commercial projects: Meshlab ( meshlab.sourceforge.net ), or even just Blender. (There are quite more tools for these fixing tasks )