Personally, I find the ViaCAD 2d/3d V6 a good adjunct to MoI.(Under$100)
Nowhere as easy for modelling but it has some great features , including dimensioning and creating "blueprints" etc
that make it a good MoI companion app.
I did not know sketchup had dimensions, I like how they change size dynamically depending on the zoom level.
It's much more simpler than fiddling with scales and print size etc..