Polo Blue Label. I'm into my third year with some after wearing them on average once a week. They still look fine.
Home launder, high efficiency machine, detergent is Tide Free. Iron on high heat, no starch.
Brooks brothers luxury line also holds up well but they are considerably more expensive.
The shirts I'm referring to are blues and patterned blues. Whites would not last as long because discoloration is more obvious.