edit i just realised u said DVD-R0M so not a burner, i dont think anyone these days bothers with dvd rom drives as they arent really worth it when you can get a dvd burner that does so much more for a very good price, or is that just me being ignorant?
Well start by telling us your budget, if you prefer to buy on line or in a store, if you need Disc quality scanning etc. The burners that do QS scanning are NEC, LITEON, Pioneer, Sony, BenQ, plextor etc. Tell us what burner brand you'd prefer as well.
Have you had a look at the reviews??? If you are looking for a good ripper then the BenQ 1650 or 1655 (the 1655 can do lightscribe) is a good choice. Here is a link to a review of the 1655; http://www.cdrinfo.com/Sections/Reviews/Specific.aspx?ArticleId=16050
If it was up to me, if money were no object I'd go for a plextor, but as money is, I would get the 1650, Pioneer 111, dru-820. They are all quite fast when it comes to reading SL and DL discs.