Not sure where this question belonged, so I put it in the design forum. Anyways, my question is, if I had the money to spend, what are some of the best rendering engines for a game that ya'll could suggest? What would make a game look the best? I mean like, the best out their? If I had the money to spend? Assuming that a rendering engine is what accumulates all of the content of a game into one and ups the graphic quality. I appreciate it.

To be honest, the visual quality of your game has little to do with the rendering engine and a lot to do with the artists.

I'm not entirely sure what you're after here. I could point at a whole bunch of highly expensive, nice looking commercial engines, for example Unreal 3 Engine but different engines are designed for different things. Plus, as Anthony Serrano points out, the engine doesn't magically make everything look nicer - you need high quality artwork, and the fancier the engine the higher the quality of artwork you need to take full advantage of it.