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The only tub I have experience with is the Master Spas LSX. If you have an MS dealer close, I highly recommend wet testing it.
Dimension 1 has lots of deep seating. Nautilus, Californian, Chairman you may find one corner in the Chairman II a little restrictive. All cost less than the Sarena Bay.HTMan
Being as tall as you are I would stay away from any tub that has the wrap around shoulder jets like the master spas. You'd never be able to cram yourself in there. I would have to imagine that tub designers shoot to mold their seating for the avarage adult human height in order to fit most people. You my friend are quite a few inches above that . I have to agree with the comment about moving around when you wet test, you'll find a tub that fits everyone in your family, I'm sure of that.