Nice render mate. liking the studio quality. Have you tried using Luxology Modo? You can get a 30 day free trial of it and use all of the features. It has some nice shaders and the global illumination settings are very versatile.
Mental ray will work great, as you are using studio max. However Maxwell Render is cool because you can set the time of day, date and wherever in the world you want the render to be simulated, and the render engine creates all of the global illumination settings for the setting you desire. You can even vary weather conditions. I use lightwave for most of my work, and that includes a plug in called 'Sky tracer'. It is a similar, but more basic version of the way Maxwell works. I also use Radiosity and Caustics in my renders to add to the photographic look. However it does increase render times. If you want stuff to look really cool, I would suggest using Mental ray, Vray (like you already do), or Maxwell Render.