Well I just ordered some Brembo OEM replacement rotors from a friend who can get parts, but they have them on www.groupbuycenter.com for a pretty good deal.

I'd say since you have 50K miles, and you are going to do the pads anyway, it might be a good idea to just do the rotors at the same time.

If you don't have any vibration under braking, etc, you could get away with using your stock rotors still, it's just up to you.

I'm turning 70K and I'm changing them for the first time as well.

I'd change fluid no matter what, your car is due.