If money is no issue, I will probably go with Santi. But I have to emphasize that I have never dived one, but from looking at it at dive shop, the build quality, fit and finish is superior to DUI.
Santi isn't even that much more expensive, and they seem to be great suits. Dove a Diving Concepts trilam for about 9 years, finally replacing it this year. Dove the Santi E.Space (entry level suit) and loved it, could have bought that rental (in good shape) for $1600, but opted to order a new E.Motion ($2950). In addition to being very light for a pretty durable trilam suit, the pockets are very well designed, much better than the ones on my old suit with options for bungee loops with or without metal rings, heavy secure flaps, extra spaces, etc...
Hated the Fusion, but that might be just me (I don't like snug fitting suits) - I know that a lot of people swear by them.
M