I cant believe when someone said Acer CD-ROMs are bad, I mean, some of the highest readability and some of the lowest prices, incredibly quiet, high performing, and they're very reliable.
NEC also make good CD-ROMs, so do Toshiba, Mitsumi and TEAC. Pioneer use to make excellent CD-ROMs, but now they only make DVD-ROMs. Sony, Panasonic, and Plextor, they're expensive and they arent really that much better than the cheaper ones. Asus CD-ROMs are really loud, but if that doesnt bother you, they should serve you well. Avoid Creative and Memorex CD-ROMs.