Campagnolo Nuovo Record is my vote. The cranks are an acceptable 'upgrade'. the black filled flutes will stand out nicely against the lighter colored frame. You've already got the most expensive part of the group (cranks). BB may cost a bit. Front / Rear derailleurs go for wildly differing prices depending on condition. I just sold what I'd consider a "Good" condition pair for $40. Rabid's build above is a good reference point for a true to period build.