Take the Boa. It's 10 times the knife the Blur is. Much better steel, too 440V vs. 440A. Also, $60 dollars NIB isn't that great a deal for a Blur. That's pretty much what you'll find mail-order. A Boa typically will run you about $125 on the internet, but that's because it's a much nicer knife.
As for the safety, it's just a little sliding switch on the handle that keeps the blade from popping open if you were to hit the flipper accidently.
Doug