another thing to consider...

many ppl say... moderate use. heavy use. light use. all these terms are relative, imho.

i consider myself a moderate user... but am i really a moderate user? here's what i have running:
* tweetdeck refresh every 15mins -- 1 FB account, 2 twitter, 1 foursquare
* google reader... almost 10 different sites. hmmm... dunno how often it refreshes now...
* gmail... sync email from 5 accounts.
* browsing about 2 hours per day
* gaming (requires internet) about 2-3 hours including games like pocket legends and inotia
* viber and whatsapp -- as and when got message, reply
* sms and calls -- not that much but still comes to say... 10-20 sms and 15mins of calls per day?

and dunno what else runs in background like that silly wifi sharing, etc... dun forget, GLU games also run in background.