Personally, if I could only have one modern folder, it wouldn't be any of those 5. Here's why:
Benchmade 940-1 Carbon Fiber - I'm not a fan of the 940. S90V and CF, they're okay; but I'm not crazy for either.
Benchmade Bugout 535GRY-1 - the Bugout doesn't appeal to me.
Zero Tolerance ZT0566 CF - nope, no interest. I'd rather have a 550 (and I do)
Spyderco Para 3 Blurple - smaller than I like, I have to stop and think about the compression lock, and 110v doesn't do it for me. (If you'd said cruwear, 52100, or uncoated M4, I would have taken the Para3)
Chris Reeve Sebenza Small w/ Macassar Ebony Wood Inlay - the small sebenza is okay (better than the large, surprisingly); but I have a WC small insingo, and wouldn't trade for drop point Mac Ebony.