What do you think the best collar style would be for wearing a blazer or sport coat sans tie?
I'm sure most will suggest a button down collar. While I wear a button down about 3/4 of the time for my business casual, I don't hesitate to wear a point collar also. I generally wear a point collar for social occasions at night when I'm wearing an open collared shirt with either a suit or jeans/blazer. I especially like a white point collar dress shirt at night with jeans and a navy or black blazer.
I think there's some truth in this, though for me it's more along the lines of certain unbuttoned collars suiting me better than my preferred buttoned collar style.You might want to go with collars that normally wouldn't suit you, since you wouldn't otherwise have an opportunity to wear them