Which Paintball Barrel Should I Get?

I mainly play woodsball, but I enjoy going out to the field as well. I have been looking for an upgrade to the stock 14" on my WGP Trilogy Tactical SF. I have found a 14" Proto Barrel for about $15, The 14" BT Apex 2 for $45, or a 16" CP Barrel. Please give me your thoughts or any other suggestions for other barrels under $45, I need a second opinion. Thanks.