I don't have personal experience with TiNives or Tighe but I'm a dealer for both Elishewitz and Reeve (and a personal owner of each.) I'm a dealer for these because I consider each the best in it's category. Reeve is for me the pinnacle of production knife manufacture and Elishwitz makes my favorite tactical folders.
A few comments, I guess. Elishewitz is a martial artist and his design philosophy, I think, tends in that direction. I would characterize the Elishwitz knives as sturdy, relatively heavy, hard use knives - but with all the smoothness and fit and finish one would expect in a custom tactical folder. If you like your knives beefy, you would really like an Elishewitz. They are really exceptional. I own a dresed up Ares that has caused some knife-knowledgeable jaws to drop.
The reeve knives are production knives but they are made with quality control not often seen in any product, let alone a knife. They are also exceptional products. I view the Sebenzas as using knives of flawless quality and action. Some of our Reeve Sebenza customers have some pretty high powered and expensive pieces of personal cutlery and yet I hear nothing but praise for them. I can't say enough in favor of my Umfaan (a miniature Sebenza.)
Either of these choices go well beyond what you might experience from the better production knives like Benchmade, Spyderco etc and, of course, they are more expensive. Once you get spoiled by knives of this caliber, it's hard to go back to the mass produced knives. I've always been a believer in owning fewer better knives than more lesser knives and I can recommend either of these without any hesitation. Take care.
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Fred
Knife Outlet
http://www.knifeoutlet.com