as far as drives go i like lite-on because they're cheap, they work, they're the short kind and the retail packages come with both nero and powerdvd (of course those would both be useless to you, a mac user )
that's assuming you'd like a dvd burner, which is probably a good idea as a good one (16x, DL, name brand) can be had for less than $50 online.
you'll also need patchburn for os x and all of your apps to recognize it
You will probably have to take the front door off the drive,'s tray, because the QS has those freaky oval shaped openings in the bezel. Or you can attack the bezel with a file to give clearance.
Its very easy to change the optical drive on Quicksilvers. As for the drive you will need to clip off the front of it when its open so that it doesnt clip or get caught in the quicksilver's door....