Hi:
For the number of OS's you wish to install I would strongly recommend Terabyteunlimited's BootItNG. It is shareware (39.99 I think) but you can try for a month to see if you like it. The beauty of the Linux distro's is that using the completely stable ntfs-3g
driver you can read and write to NTFS volumes - for example sharing VM's between Linux and Windows or just use Linux to download windows file if you want to stay in Linux for a bit. Using Openoffice editing files in Windows and Linux is also easyi.
Good luck.
Marty