We haven't found out with either one and wouldn't have it any other way. I will never forget the look on DH's face after our DD was born and on my chest he looked at me with tears running down his cheeks and told me we had a little girl. Our gorgeous little Olivia was here. It meant the absolute world to me that he got to tell me when he did and not a stranger who just happened to be doing my 20 week ultrasound.
I understand people who need to be organised though. I'm usually like that but I was still organised and I have a full wardrobe of pink and blue. All my DH had to do was wash it. DD was only in white for the first day. We returned all the blue stuff.
I know some people think will I be disappointed if I know the sex or don't know the sex. Best of luck making the decision.