multiple booting OS How much HDD space for each?

[NRJ]

I don't want the minimum or recomended HDD space. I just want to know your recomandation. I got 4 OS that i want to install on 2 PCs.

1)Win2000pro
2)WinXP pro
3)Win2003 Entreprise
4)WinVista Ultimate.

I made the mistake the last time I made a partition for XP to only put 12GB, so thinking going at least 20 this time. How much do u think i should partition for the other os? Also thinking of Moving "My Document" to it's own partition (some games like sims2 can make your folder big). Can 2 or more OS have the same My Document location?

Would u recomend the partitions for each OS on a same HDD or different HDD for each OS?

I only use VMware for testing only, not for running games or programs.

 

[NRJ]

ok was thinking of having on PC1 Vista, XP and 2003 and on PC2 2000 and XP.

I got 2 XPs. one Home the other Pro, since i will probably not allow me to the install the same OS on both PC without another license.