Looking for a good large blade knife(price doesnt matter,just a bigger blade than 11-inch) , ive heard good things on and the ontario rtak and rat-7or machetes/bowies.any good ones out there?

also im looking for a good headlight. i have a energizer one that works well,but im looking for another. any good ones?ive seen princeton tecs line but i would like to know how they perform.

thanks