The CL-15 is both DOT and Snell certified, so for me it would be good enough. However how the helmet fits you is, IMO, even more so critical. Higher end helmets obviously will meet the DOT and Snell (or other) certifications, but they might be able to achieve it with a lighter helmet and more importantly comes standard with different size padding to ensure a custom and perfect fit.
I am way overdue for a new helmet and will be getting the new Shoei RF-1100.