I'm looking at doing something similar with my late 80's bianchi steel bike. It was low-end then, but it was my first real bike, my parents bought it for me, so there's a lot of nostalgia there.

So I'm wondering about the need to upgrade the bottom bracket, cranks and front derailleur. Everything I've found online says that these can stay. Is that not correct?

My current setup is Shimano, and I was thinking of doing a mix of SRAM and Shimano so that I didn't have to swap out the BB, cranks and front derailleur. If I have to change everything than I'll just go Campy.