SketchUp will empower you to model in 3D, LayOut will improve your documentation for those projects and Style Builder can let you tweak your style in SketchUp. You can use 3D Warehouse for additional content in your models and you can add Extensions from the Extension Warehouse for further functionality. In addition to these features, you may find you have other needs that you can't accomplish directly in SketchUp.
V-Ray Next for SketchUp
Once you've created your SketchUp model you may wish to make it more photo-realistic for presentation to your clients. V-Ray Next will work directly with your SketchUp model, allowing you to add textures and lighting effects beyond what you can accomplish with SketchUp.
Your architectural and landscape designs can be extended to include energy analysis. Using SketchUp PreDesign you'll be able to identify aspects for consideration based on weather and region.