Just a word of caution mixing PCII's. The 98/99 TL1000R and 2000 TL1000R will not use the same PCII. Something was changed at the plug for the ECU. When you plug a '99 PCII into a 2000 model you get no power. The changes were only supposed to be cosmetic for the model change, but we have found out otherwise. Why was it changed? I'm sure if Suzuki fixed something they won't tell anyone. If they did, then all the 98/99 owners would want a fix.
Not sure about the 'Busa / 750 models, but may be wise to check with DJ before buying one.