If we put BL players aside, I think
Makaay was one of the biggest signings.
Maybe because I'm Spanish and I was familiar with him, but when I heard he was moving to Bayern I was increidbly happy as he was one of my favourite players by that time and Elber is of course my all time favourite striker, so it was like a dream
Then Elber was sold to Lyon in the pre season
Ribery was also a big one. I think it was only us and Real Madrid fighting for him at that time, but he chose Bayern in the end

Robben was different because no one was showing particular interest on him by that time
I remember we were very close to sign Ruud van Nistelrooy as well, but he chose Real instead