I do not sell Walker, Brinkman or Basis. I do sell Grand Prix Audio.
While I like all the tables you mention, I would probably recommend in this order:
1. Brinkman - Easy to setup, excellent build quality and sonics.
2. Walker - Excellent sonics, very difficult to setup unless Lloyd does it for you. Very tweaky. If you move or paint your room, could be very frustrating. If you purchase, you get, as a bonus, Lloyd's wonderful sense of humor.
3. Basis - Not quite at the same level as the previously mentioned, but rock solid reliability.
I would be remiss to say that I feel the Grand Prix Audio rivals the best tables I have heard. It is a direct drive table that keeps, probably, the best speed and pitch of any table on the market. I feel this is the most important function of a turntable.
The good news is there are no bad decisions on your list :)
Jonathan Tinn
Chambers Audio