Evermotion models usually come in the following formats: MAX C4D OBJ FBX, with several flavors of Max files, not just for Vray (scanline, mental ray, etc) and you only download the ones you want when you want.
I would go ahead and buy the Evermotion set, then download a demos of the Simlab importer plugins for sketchup - obj importer, fbx, etc. and see which ones works best for your workflow. The $100 or so for the Simlab plugins are definitely worth it if you plan to use often and want to build a library of skp objects from high quality Max models. They are fast and do a good job if you use them correctly.
Again, install demos of various Simlab importers for Sketchup, then try importing different file formats to Sketchup to see which works best for you. (if you don't want to purchase Evermotion set yet, then you can try downloading free assets of various formats.)
Also, the general work-around for doing 'real' 3D work without having a 3DS Max license is using Blender. There will be a slight learning curve, but you can open files, layout UVs and export to different formats.