Looking for a phone/tablet recommendation that can be conveniently used to pass my time or do productivity work. For example, easy and fast access to the internet(has to have 3g/wifi). Screen not too small(so i can read) not too large(till i can't put in my pocket). ******* I will be using this a lot in the library or wherever with access to internet so i can study conveniently, searching up information on a smaller screen apart from a laptop. Battery life has to be a plus. Isn't laggy, touch screen, has a lot of access to different apps(for gaming, for work, productivity apps such as dictionary calender). Has to be able to handle video well(able to go youtube etc, watch video clearly doesn't have to be SUPER AMOLE etc). Others are a plus ( such as camera etc)

Brand: Any
Price: As low as possible
Specs: As good as it can get

Looking at: Galaxy S, Nexus S, Galaxy W, galaxy R, xperia Arc, dell streak 5.0, amazon kindle fire, galaxy player 4.0 and 5.0, iphone 3GS or 4, ipod touch.

Basically what im looking for would be the most cost--effective GADGET that can fulfill my ABOVE requirements. THANKS! =D