In that case, why are you looking for a “reasonably priced” laptop? The Apple tax is indeed 50% or more, but it should be a straightforward decision if it fits your other requirements.
Sure, there are diminishing returns; but I don’t see why you wouldn’t spring up $3000 for a maxed out Macbook, considering the cost is still orders of magnitude less than what your business brings in. Unless you really hate the touch bar?