the more modern OS's can handle larger partitions. NT, for example, had a primary partition limit of 8 gig, but the succeeding partitions could be a lot larger. I have a Windows 2000 partition of 40 gigs, and another of about 70 gigs (was gonna install Linux on the remaining 10, but it's more trouble than it's worth at the moment..;). I think XP could handle larger sizes..the partitions depending on the Os formatting (Fat 32, NTFS, whatever the NT '5' one is called, it escapes me at the moment..;)
I think what you're suggesting should be plenty..

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)