CAK or AK first. WWII after that.
So many models, so hard to choose. However, the above models come up pretty often and are among the most widely sold HI blades, and most useful for heavy chopping. The WWII is a little lighter weight and perhaps more versatile.
As for CAK vs AK: The only difference is handle type, which also affects the balance a bit. The CAK is more visually appealing (to me, anyway, and many others), while the AK handle is probably easier on the hand, especially in cold weather. If you are in a dry climate you might get a little handle slab shrinkage on a CAK, which can expose the edges of the full tang, but that is easily fixed with a fine file.
Over time you'll probably end up with all of the models mentioned in this thread, so maybe the best approach is to get whichever one comes up next on a DOTD thread at a price you can justify to yourself.
