DVD would be cool. i would even pay extra for it.
ive had a dvd drive for about 6 years now...im just waiting for blue-ray!
Its not that annoying to install a dvd drive, just crack it open, slide it in, plug in 2 wires...you're done. unless you have a seriously old case...and then its only slightly more difficult and you have to deal with more screws.
either way i doubt it could take more than 10 minutes.