So looks like it came down to a choice between 
SWC 160 and  
Bubble Magus NAC7
both skimmers have  same Atman2500 pump, same shape (cone), same air intake.
The only difference is SWC has air intake control but you would want to run at full air anyway.
NAC7 is aprox. 220$ shipped
SWC 160 is $274+tax= $307
Just wondering if i am missing something here?
thank you.