If I was going to get a entire hardrive for a dual or triple boot (main OS would be on a SSD) how large a harddrive for XP and or Vista and or Windows 7 (32 bit)? -- In the effect (and which is the case) that some games won't run on a multicore processor (like Cod: United Offensive, won't for me) . . . 500 GB? 1 TB?