well if you know how to build a pc.. then hire jim (via net) for an hour to go thru it with you.. is another option.
there is a certain games pc maker in London.. who someone who I thought knew their stuff (they do web php / asp etc ) got a quote from, they did a friend over good and proper.. who wasn't as clued up , but knew something was iffy design wise and he was right.. they denied it even after the producer of the part to him an email stating the "issue"