350W is a little low for a modern PC, and 16A on the +12V rail is definately low, but if its low decibels your after, it might be a good buy.
Personaly, I wouldnt pay for a PSU other an an Antec, or an Enermax, or some other reputable brand. Nexus don't appear in any lists of good PSUs I found, but they also dont appear in any lists of bad PSUs.
This site:
http://shsc.info/PowerSupplyGuide
Gives some basic advice on choosing a new PSU.