Aside from the minor quibbles with Benjamin's major point, there are two alternatives you might want to explore before purchasing a new machine. One would be to consider submitting your scene to a commercial renderfarm, and just paying to have them make your animation final product for you. Would cost less than a new machine. The other, suggested by Benjamin, is to invest in a major change in software. This means purchasing Cinema4D, or renting Autodesk MAX or MAYA for a month, and purchasing Vue Xstream to go with these. Of course, this is the expensive alternative, probably more expensive than a new machine.