Go with Aqualung Titan LX,Mikron or Legend also B2 or Z2 are good choices can't go wrong with any of them.
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What awap said.
Also keep in mind that regulators have come a long way. I can't say that any particular brand of modern regulator isn't reliable. I like Mares. Their regs are built like tanks and can take a lot. I've known some to go years without even being serviced and still functioning fine (not that I suggest it). You can spend anywhere from a few hundred to a few thousand dollars.
Why would he--or anybody--choose the T2X ($1550) over the B2 ($650) or M1 ($700). I know you said, "if money is no object," but even the most profligate among us demand some added utility for their marginal dollar. What makes it worth more than double its stablemates, both of which also have a 2-year/300 dive recommended service interval? Is it the 1/2 pound in weight savings? Would it go better with his HUB?If money isn't an object, I would go with the Atomic T2X? Yes, it's pricey, but only needs service every two years. Get a T2 alternate air, also. I've had mine for a couple of years, dove with it in Galapagos to the Caymans, and love the reg.
Why would he--or anybody--choose the T2X ($1550) over the B2 ($650) or M1 ($700). I know you said, "if money is no object," but even the most profligate among us demand some added utility for their marginal dollar. What makes it worth more than double its stablemates, both of which also have a 2-year/300 dive recommended service interval? Is it the 1/2 pound in weight savings? Would it go better with his HUB?