There are a variety of brands of Japanese style soaking tubs to choose from. If you have the chance to go to a bathtub showroom, you should definitely make the trip to test the bathtubs out and see if they are comfortable to you. If you are located near California, you should make a visit to Tubz, they have the largest showroom of bathtubs in the Unites States and you'll be able to try out hundreds of tubs.
This is a brief list of different soaking bathtub brands and manufacturers. You'll be able to see the different styles, prices, and designs available.