If he's a banker, get something classy and not common. Try looking at Nomos. It's not well known as Tag or Omega (this is more like a brand that only watch enthusiasts know) but they beat the pants off any 2500 dollars Tag/Omega inside out.
They're German handmade.
But if you wanna go with something with mainsteam name, I'd much rather have Omega than a Tag. Maybe an Aqua Terra.
If you're looking at Nomos, also consider Stowa - also handmade in Germany, and made to order. Beautifully finished movements, and something that you definitely don't see everyday.