CO2 regulator kinda question

[K85 Octane]

I can either go with this regulator for my tank:

http://www.outbackequipped.com/products.asp#reg


Or buy something like this, cheaper, and have a few more pieces. I just don't know if this will work with MY tank:

http://www.ebay.com/itm/Kobalt-Port...930?pt=LH_DefaultDomain_0&hash=item337a2c8852


What would you do?

 

[mr250twostroke]

I received one of the Ebay style a few Xmas' ago, its called a JacPac though. Never used it... What size is the fitting on your tank? I don't know if they differ.