Device Name: Sony Ericsson Xperia arc
Internal Memory capacity: 300MB
Memory Card capacity: 16GB
Apps: <1 GB
Music: 2 GB
Photos: 2 GB
Videos: 10 GB (Camera + Downloads)
Other docs: 0.5 GB
Cloud Storage: <1 GB (Box)
IMO 8GB is more than enough for anyone. Considering the price point (mostly being bundled) and the memory management (taking backups etc). I got a bigger capacity when I went on a tour and used my phone to shoot 720p video which takes up a lot of memoey.
Smaller memory also makes people take repeated backups at shorter intervals. Since many memory cards fail at one point or another, a smaller one would cause little heartburn and most likely would have compelled you to take a backup of the data at a shorter interval. So
small is better here