I would get a small/large drive combo. Say, a 20g partitioned for system files and backup, and a large drive, 40g, for apps or just your work. It's nice to have some redundancy, and you could always just use RAID to array your disks. 2 HDD's is really nice though. Take it from someone who has had 2 full meltdowns with total data loss. Maxtor has a 40g for $80 i think, and it's slightly faster seek time than an IBM.