The biggest factors are what your desired specs are. Do you want something large or small? Fixed or folder? Regular production, midtech, or custom? What blade steel and handle material? What lock? What opening method?
Without any criteria to fill (apologies for rude wording, but I want to make it a little funny) you may as well have said "Me want knife, have money".
Even if you aren't sure on the super specifics like opener, lock, materials, and price you can at least give us an idea on size and style.
As for what you asked, I would say not to bother with a MT unless you can handle it first. They carry a reputation of having hit or miss Qc and I have not heard a whole lot of good about their CS. If you aren't dead set on something like a Sebenza you would do just fine to stick to the big 3 and just look for the right production model for you. We can help with that