I think there is so much black on the bike all ready that adding some plain white accessories might be a bit much. I think if you had a white bike adding the black accessories would look pretty sharp.
One thing you could do would be to get black parts and just add like a white stripe kinda cafe racer style. Now painting can be expensive but another possible option would be to put on some white vinyl as a stripe. A friend of mine is a sign maker and does custom stuff like that and it looks pretty nice. Maybe find a sign maker in your area and see what they could do. That just opens up a world of options if your looking to customize your bike without breaking the bank.Here is an example for ya
Here is one pic I found of a custom Street Triple if you need some ideas
http://static.blogo.it/motoblog/spec...iple675r01.jpg