This is still one of my favorites
http://www.amazon.com/BlackBerry-810...ackberry+pearl
I was always able to get a great battery life because BB has the feature that lets you sleep the phone at a set time (11pm) and resume at a different time (say 7am). The battery used to last me the better part of a week. My iPhone.... not as much.
And its at a good price point.
EDIT: WOW.... ok conceptually its a good idea but reading through the reviews it might not be advisable. Its not getting good reviews on what is delivered