I would consider the following writers, at the moment:
1. BenQ DW1620 - pros: quality (P-)CAV burns at 12-16x, quality scanning, overspeeding; cons: none, really.
2. LG GSA-4163B - pros: 16x P-CAV if you have access to 16x media; cons: Z-CLV strategies below 16x, no quality scanning.
3. (on your list) NEC ND-3520A - not familiar with it, but hear it's a decent writer (others will give you better information).
I wouldn't touch either Lite-On SOHW-1633S (poor quality at 12x and 16x) or AOpen DUW1608 (super-slow Z-CLV strategies, poor quality at any speed).
So, that narrows it down to ND-3520A by exclusion. (But I still suggest a DW1620.)
P.S. Yes, I know this is the NEC forum.