Have you sorted out your memory cards? And an extra battery?
I would suggest though to take your time over each photograph, if you just blast away you'll easily fill a CF card with lousy pics that you'll have to waste time editing and deleting later. so pay attention to composition etc and try to develop your eye. If you haven't already that is!
You might find the 50 a bit long for street photography if it is your widest lens though. It is good for portraits as I'm sure you know, remember that at f/1.8 the depth of field is very narrow, so stop it down a bit. The 70-200 is a fantastic portrait lens at 70mm or longer, great if you have a bit of room.
If you've got any money left, I'd suggest consider a wide zoom for general walk about - the 17-40 L suits me fine but there are others with great reputations.
Regardless, go have some fun!