Hmm, take my advice with a large grain of salt because i'm new at this as well, but if you're going for a "best bang for the buck" sort of build, wouldn't it be better to get a dvd drive without lightscribe and maybe rated at something like 16x-20x? Or is the 24x required for certain games? Gaming is definitely not my forte, but just some thought. If you were able to drop the price by $15-$30 then the OS would only put you about $50 over your budget.
Once again, I'm not very experienced in this, if someone says that I'm wrong, then I probably am
EDIT: My bad, I should have looked at the price of the optical drive listed by Trotter, its only $30, might as well get better one, the $5 more would be well spent. But thanks for the thread, has helped me out some.