I have both a Sifu and a Spyderco Military. You want over a four inch blade, so the Sifu or Cold Steel Vaquero Grande are your two main choices. I really like both my Sifu and my Military, but they are distinctly different knives. If what you mean by "tactical" is "sport/utility", then go for the Spyderco. More useful (to me) blade shape/grind, better opening mechanism (hole), and better steel (at least until REKAT starts using D2). OTOH, if "tactical" to you signifies "killing people" or "scaring the crap out of people" than your best bet is the Sifu. You can find a Military for around a hundred, Sifu for about twenty-five more. Either way, you really can't go wrong with either of these knives. I'd probably stay away from the Vaquero Grande, just because many people dislike the serrations, I don't the handle, and I don't really like Cold Steel folders.