Total value of these computer part's?

You often get more for a computer by "piecing it out" as you plan to do.. but its only worth it IF the buyer has to have it, IF the parts are "not readily available" All of that is not worth much to some one building a "new" machine... go to Craigslist or ebay and see what your parts will bring on the open market...you'll get a better idea of what to put them up for.