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Are you not happy with another Mira Advance?
Mira are still a good make of shower but Triton are also very good. its more a design choice rather than quality. I am presuming your wiring and consumer unit can take a 10.5kw shower. A good many showers today have multipoint for the water inlet and this would need to be checked when you find one you like.
Here is a standard shower I tend to fit with multi entry points .