You have covered a large array of manufacturers with a range of different pricing.I've had a couple of Sebenza's myself,and I always was happy with the quality,there are a number of models from Spyderco,and Benchmade that would make most people extremly happy.I also am very impressed with the Microtch LCC for the price,it is one of the best deals out there.
I would say you would be happy with any of these manufacturers.Opinion's about what is the best folder are going to be subjective.If you also run a search you will see the same thread and will help you in your quest for the best folder.If I personally would have to make a list of some of my favorites I've owned in the past here are some to help you with your decision-Chris Reeves Large Sebenza,Benchmade 710,940 Axis Locks,Microtech LCC,Spyderco Police/Native, Speedtech Synergy(Out of production)but one is currently for sale by another formite in the For sale section.Thats about the end for my list of productions,although there are plenty more great production knives available then what I listed or have experience with.I've owned a couple of customs.I loved my Elishewitz with mokume bolsters,really not to much difference in price from what I paid for my Sebenza.In fact there are many custom makers selling folders that are reasonably priced and would make great daily carry's.Shop around and see what works best for you.Good Luck,Ralph