Length/fullness of hair will always catch my eye before color. Like most guys I do love long hair.
Hair color.. <shrug> it is how they work it, style it,etc. A blonde with stringy dirty hair stuck to her head glumly walking down the street just doesn't do it but a lady with a bounce in her step and long silky locks swaying as she walks, will definitely get my attention.
It has long been joked "guys will f*** a blonde but marry a brunette" based on the premise that blondes do get noticed first. Not sure the merits of that but ....
At this point I am more concerned about which ladies could possibly notice me with NO hair since it seems to all be about color. Personality better damn count for something or I am seriously screwed! (and not in a good way)