I like the Skyline more than the Flash II.
Some other ideas - all in the $20-40 range, with the exception of the Delica, which is closer to $55.
Left to right: Cryo, CQC-5K, Zancudo, RAT-2, Leek, Delica, Volt II, OSO Sweet, Dozier Folding Hunter, Skyline, Cryo II, CQC-6K, Injection 3.5, Flash II, Blur, Avispa, RAT-1
From my experiences carrying and using these, my top picks for a beefier, more rugged-feeling knife would be the Blur, CQC-6K, and RAT-1. For a more compact, easy-to carry knife, the Leek, Skyline, and Delica would be my picks.
There's a large range here, obviously. Are there other attributes you're looking at, other than $40 or under and 3.5" blade or under?