Reading through this I realize how few non-rule rules I have.
I will wear button downs or loafers with a suit, albeit rarely. I prefer spread collars, but that's because I think they suit my face best.
I will be adventuresome with a tie with a suit, but rarely with socks. Pretty conservative colored argyle are about as out of the box as I get.
I wear bluchers exclusively with a suit, but largely because I have a high arch and oxfords just don't fit me well.