Check reviews at:
http://club.cdfreaks.com/index.php
Plextor is very good but (over)priced. You may check Benq, LG and LiteOn drive - I don't know how performs external burners but internal are very good.
Drive is not the only to look for. Discs: TY, Verbatim (the only for DL), Ritek. You will get also a bit better burns with SATA HD.
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