I'm thinking of buying a low-end 21.5" iMac. The only element I will upgrade is (of course) the storage option. But I can't really decide between a 1TB and 2TB fusion drive. So how much flash do you actually need for casual use? To give you an idea, here's some apps I'll probably be using: - Chrome browser (by far no. 1) - 1Password - Dropbox - Plex Media Player - VLC - Microsoft Office - Goodsync I've only ever used Windows, so perhaps there are some new apps I wil use, but I think this gives you some idea of what I'll do with it. No photo/audio/video software, but mostly browsing, office work and media playback.