I looked briefly at your website and I don't know if anybody thought of this but this is a really great way to get your "parts for sale" in the forum. You could just do this every so often and think of all the new customers you would gain. Then again, some might think you are just trying to sneak your "parts for sale" into the discussion section rather than in the "Parts for Sale" section.
you're still working with that one page gets all, sooner or later.
i would prefer a home page with categories to choose from.
based on year of car, type of part(interior, exterior, drivetrain, etc.), that way when i visit your site i don't have to sift thru all the parts i'm not interested in at that time.
just an idea
ps disregard the critics, they're always out there.