I really like the "Featured System" functionality.

In fact, I think you should focus on the Featured System thing. I am a casual DIY part picker, and I would rather just browse several community vetted configurations.

Other people are more interested in building a system from scratch, or commenting on other people's configs.

Now, imagine a "fork this configuration" option! So a builder can fork someone else's system but make some slight mods.

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Please add a Disqus thread to the bottom of each page, so people can comment on the configuration or part.

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Also, if you are buying a bunch of parts, you might be able to save money on shipping by ordering parts from fewer distributors. Incorporating shipping cost would be another useful feature, but perhaps tricky to implement.