I was thinking about going with 256 initially, but after pricing an enclosure and disk, the 512 isn't as outrageous as first thought. I mean it is outrageous, but realistically, the 256 has to be the minimum buy (I cannot believe they actually offer 128), so you are looking at $200 to go to 512 ($180 EDU), which is about what you would pay for a 512 external it seems. I know you would end up with more storage going that route, but if it is a "now" investment, I think I prefer 512 all internal over 768 split. If I could get by with 256 for a while before having to add external, then it would be a tougher choice.