Cost is exactly propotional to the quality of the machine......or for the most part it is. There are many small machine out there that would do this job, but I think you need to ask yourself how accurate do you want to do the job? I have a machine that is huge and vibrates if I run it too fast, but it would do the job. On the other hand, a vertical machining center designed for metal work would be capable of making that piece so smooth you would barely have to sand it.
Now.......what does the second pic represent? Is that energy from a recording or a computer simulation?