You want one with a G-10 handle. A Benchmade would be great except it probably doesn't fit your inexpensive qualification. Get a spring assist blade--they aren't automatic and so are legal in a lot of states. I would go to this site--listed below--and check out their spring assist knives. If you want to go auto then the Boker knives are great for the price. The Jim Wagner knives are both good for tactical/emergency situations because they have good blades and have a skull cracker or glass breaker on the end. Not quite as light as a knife with a G-10 handle but not all that heavy either.
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