For SafeDisc 2 Philips is one of the best drives... however I would never recommend a Philips burner! They don't have a very good reputation and lack in reading abilities. If you're patient you could wait for the 24x Plextor model. It may be more expensive but you certainly get what you pay for Other writers that can do SD2 are listed here.
Ps. Don't forget to check out the CloneCD hardware requirments for more information.