DVD Rom drives are not much less expensive than DVD burners. You currently have a DVD burner I assume, is it dual layer, if not you might want to get one also newer burners are usually faster with less errors than older models also Lightscribe is something you might want. If you already have a dual layer burner that you like there is very little reason to get another one a DVD Rom drive would work fine. This http://www.newegg.com/Product/Product.aspx?Item=N82E16827135097
is a good DVD Rom drive and quite inexpensive.