I am looking at buying a Benchmade griptillian ,and I am a little confused . REI has there exclusive version with g-10 scales and s30v steel. Knifecenter has the 154cm steel. Cabelas has it with d2 steel. I know that the REI's is more money but please help a new guy figure out the steel. I also hear that they can be had with m390 and other steel too .