The nXt Renderer by IRender is a rendering plugin that integrates really well with SketchUp. The learning curve on this plugin is very small and you can start rendering almost immediately after installing the plugin. The render quality is pretty good, but just out of reach of photo realistic rendering, unless I am missing something. The plugin does also take some of your computers processing power away and takes a little while to render, about 10-15+ minutes per rendering.
This render offers some great features such as easy to control rendering tools. The tools allow you to choose specifically what you want in terms you can understand. In addition, the renderer comes with light fixtures and tools to easily add an amazing effect to your model. Even if the renderer seems too complicated for you, IRender has great support and tutorials on their site to help you through the rendering process and create exactly what you were looking for.
Overall, the nXt Renderer by IRender is a great solution for your SketchUp rendering needs. At the time of this review the nXt Render costs $399 for a single license. They do have other options that have more or less features for reduced or increased prices. The plugins are available at RenderPlus.com. I give this plugin 4 out of 5 stars!