But why not learning Blender (free and great tool) , or TrueSpace, or Wings3D ?

But if you have fun using google sketchup, and find it easy (i found it really easy and fun to use also ) ; in their site , it is said it can export to these formats :
3DS, DWG, DXF, FBX, OBJ, VRML, XSI.
A7 can import 3DS, FBX or OBJ formats, so go for it