Thanks for your replies everyone. I should have been more descriptive in my original post. The frameset is brand new with 130mm spacing and English BB threading. I guess what I'm interested in hearing is people's opinions on what would worth aesthetically.

Ultegra 6600 and Campy Athena alloy would work well IMHO. I've got 4500 (Tiagra), 6600 and 7800 on my other bikes so I'm quite used to the Shimano system. I am very tempted to try something different however.