There are a few more worth consideration,
The Pegasus, which IMHO is the best of the small SS lock-back Spydies. Blade shape, size, and thickness are almost identical to the Copilot, but the SS scales are a bit thinner, and the shape feels better in my hand. The handle design also allows the knife to ride deeper in the pocket when clipped, which can be viewed as a pro, a con, or irrelevant; depending on how you like to carry. The hole is also larger than that in the Copilot, which adds to the ease of opening. The thinner scales and the larger hole combine to make the knife a fair bit lighter than the Copilot. Both out of production, but fairly easy to find NIB.
The Dragonfly, even lighter than the Pegasus, it has a slightly longer, but thinner blade. It is about the same length closed as the Pegasus and Copilot, but longer open due to the increased blade length. The handle is slimmer top to bottom than the Pegasus, and lacks the center "bump" to help position your hand. The blade has a less pronounced "hump" than them also, making the knife smaller when closed, but pays the price for this by having a smaller hole. Clip placement is, for me, terrible, but opinions vary here. Tip up carry, with a full inch of the handle exposed above the pocket is not my cup of tea. Easy to find, as it is still in production.
The Calypso Jr., to me this is one sweet knife. Very similar in size and shape to the Delica, it has one feature I prefer, the finger choil. On the other hand, the Delica offers a slightly larger hole, the option of tip up or tip down carry, and the fact that it is still in production. I can't really put my finger on what it is about the Calypso Jr. that makes me favor it so strongly over the Delica, so can only say if you have the opportunity to handle both of them, by all means do so before you decide. Like the Copilot and Pegasus, the Calypso Jr. is out of production but pretty easy to find.
Will only add that, as much as I love my Native I and Native III, I have yet to acquire a Native II, so can't really judge it fairly against the others, but am sure it is a very comfortable knife to use as it would have about the same ergonomics as the Native I. It would be the largest in OAL of the group you mention, pushing your 7" OAL limit a bit by a hair if that is important.
