You may find these threads useful:
http://www.scubaboard.com/forums/regulators/342944-atomic-b2-z2.html
http://www.scubaboard.com/forums/regulators/342232-question-atomic-users.html
http://www.scubaboard.com/forums/5027324-post18.html
Even the least expensive regulators on the market have gotten so good that you cant make a bad choice.
http://www.scubaboard.com/forums/regulators/342944-atomic-b2-z2.html
http://www.scubaboard.com/forums/regulators/342232-question-atomic-users.html
http://www.scubaboard.com/forums/5027324-post18.html
Even the least expensive regulators on the market have gotten so good that you cant make a bad choice.