The best course is the one that suits you and as were all different people different things are going to be important to each of us, for some its cost, others its location, reputation, length of time established, who the instructor is, has it got a survival slant, or a spiritual one or is it just pure bushcraft (although the definition of that is open for debate!)
A course is not overpriced if people are happy to pay the cost of attending, for whatever reason they see the value in where their moneys going. Some people think that some companies are overpriced, but thats a personal opinion based on their priorities.
What I would say is that you need to pick the type of course you want to do, make sure that you understand the content of the courses. The best way to do this is to call the companies and talk to them, have some questions ready and ask anything you feel is relevant. Talk to people that have done the courses (as you are doing here) and even visit the schools if its convenient.
Most of the schools are very professional and theyll bend over backwards to help you in your search for the right course for you. Remember that youre the man with the money, they want it.
Youve listed some schools but there are others as well, some have the spiritual aspects, or the survival aspect, some are run by people with normal jobs during the week and teach bushcraft at the weekend and others are run by full time companies (that do have a lot more overheads than those doing the weekend thing) Have a look
here for some more schools, (although the list isnt complete as Im upgrading it in the new front end thats going up)
Listen to what people say about the content of the course and the quality of instruction, thats the key issue, The schools youve listed all have good reps, some of them have been going a lot longer than others, some of them provide a lot more course variety than others but youll get something out of all of them. Geographically Woodsmoke is probably your closest out of your list, have a chat with them and see what they say. Travelling distance could be one of your considerations, what you spend on petrol, or the train ticket to get further afield could make the cheaper courses comparable on price??
Ive gone on enough about all this, the bottom line is that its a personal decision and youve got to do the legwork, youve started on here but theres a lot more you can do for yourself before you decide on the school for you.
Good luck halo, youll not regret getting stuck in with one of them