D2 is great.I've carried one of my two Boker Kalashnikov Auto's for the past 7-8 years (replaced a Gerber Leek).
Blade Ops usually has them on sale for around $30. Neither have failed yet. You do need to sharpen the D2 steel with some frequency, but I use these for beater tasks. They are disposable, but just haven't failed.
Auto open is super convenient and always fun.