Is the new Mac Pro Overkill as a Gaming Machine?

I am currently using a high end MacMini (2012) with maxed out RAM. I do quite a bit of photo editing in Aperture but no video or 3D work. I do however enjoy playing X-Plane 10 and Sim City but find I cannot really raise the graphics options in these games very high at all. I would really love to be able to max out all of the graphics options in these games but the question is would the new iMac i7 with the 4GB graphics card allow me to do this or would I be better off with the MacPro (assuming it is affordable).

Thanks for any help.