I would agree that commisioning a knife will get you the best result - but at a budget of £100 you would be hard pushed to commission a small neck knife, let alone a woody clone. As for "surprises" with the quality of an enzo, I beleive they have an excellent reputation and I for one have not heard a bad thing said about them.
Also, from personal experience, I would not have really had the slightest idea of what my perasonal ideal bushcraft knife to commision someone to create would be after just having used a couple of knives. I have lots of knives that I am currently trying to find the time to use and gradually picking up pro's and cons of each design over prolonged use, My preliminary finding is that a simple woolore clone is the best for me (but then, is also the one Ive been using the longest). I am fortunate to have the luxary of disposable income at present which allows me to do this (i.e. buy lots of shiny pointy things), and I know others do not. THis bring me back to Johnnyboys point - try before you buy. If you can have a little go with some other's knives at meets, then you will know what feels comfortable for you. Or see my previous point - make your own custom. You will see how it feels as you gradually rasp away the handle, and after some use you can still refine the handle a bit (well, take more off, not put it back

).
Hope that makes sense, and helps.