I've got the M16-14SF and I love it. Fits perfectly in my meaty hands...
Don't grind the flippers, man. They're there for a reason.
Your money, your choice I guess...
On another note, I bought 2 of the M16s right after the design was released. They all held up well for about a year's worth of heavy use. My first problem was the
M16-14MIL. I think a dime or somesuch got wedged up into the handle and chiped the tip of the blade. At about the same time, my M16-04's (04 meant straight edge, 14 means serrated/straight) got weak and closed on my hand. The blade missed but the flipper took a good sized chunk out of my palm.
Called Columbia River and told them of my problem, their only response was, "send 'em in." CRKT decided to replace my knives and since the M16-04 was no longer produced, I got the 14SF. They charged me a little more but I'm still pleased.