Right now the only solution for you is the 3tb Seagate with 4k sector size using WBFS - there is no way, right now, to get NTFS or FAT32 to work on the 3tb drive with the Wii. You'll probably be able to fit around 1550 games on it.
Yes but if in the 3tb Seagate with 4k sector size using WBFS...