Sounds like you are looking for something new, but if you look at used DVD-roms and want something that works quietly, consider a Samsung. I know people on this forum will think I'm nuts suggesting a Samsung, but I bought one used because it was inexpensive and, most importantly to me, it was region-free! It is without a doubt the quietest DVD-rom (or CD or HD or any kind of drive for that matter) that I've ever owned. Even if I put my ear right up to it, I can barely hear the thing work - truly whisper quiet.
As for something new, all the suggestions in the previous posts are good ones. You can't go wrong with any of them.
Just my 2 cents.