It really depends on what you have already, if you have nothing than I recommend the Brioni or RLPL since your first two suits should be navy and gray. I am not a big fan of the Oxxford vintage stuff, I just picked up one of these suits at a thrift store and was disappointed in the fell of the wool, it felt stiff. So my order would be Brioni, RLPL, Isaia.
What do you think of the Fallan & Harvey Bespoke suit? It seems weird to me that he has so many bespoke suits for sale including having previously sold the same suit multiple times.