I prefer Campag for dereilleurs, but I quite like the Shimano STI setup.

As for chain/cluster/rings I hate all of the modern crap because it just doesn't last, despite regular maintenance and cleaning. Give me a good, solid Regina cluster and chain any day.

Shimano bottom bracket and hollowtech crankset for now, but Campy will bounce back.

Brakes. I want to try out a set of those superlight brakes that someone posted here a couple of months back. The red anodised exxy ones