Yowzers!
On a serious note, I prefer not to wear button down collars with a tie. In my situations, tie usually means suit. Suit always means straight collars for me.
For shirts with a button down collar, the collar should be buttoned, or else it can look sloppy. For my office shirts, I always leave the top button unbuttoned since I don't wear a tie. For my casual shirts, I usually go 2 unbuttoned.
On a serious note, I prefer not to wear button down collars with a tie. In my situations, tie usually means suit. Suit always means straight collars for me.
For shirts with a button down collar, the collar should be buttoned, or else it can look sloppy. For my office shirts, I always leave the top button unbuttoned since I don't wear a tie. For my casual shirts, I usually go 2 unbuttoned.