I ordered 2 anker 1900's with charger for both the wife and mine sensations. With background data off most of the day I average 26hrs. With background on all the time, the wife is averaging 21 hrs. We both use the phone for at least 3 hrs a day talking, games, internet ect.
With shipping $28 and change, I ordered from here www amazon com/Anker-1900mAh-Battery-Sensation-Universal/dp/B005B3RFTU/ref=sr_1_2?ie=UTF8&qid=1311102607&sr=8-2[/url] (You need to fill in the 2 dots)
The charger is cool, you can slide one battery into the side, and usb cable to the phone out of the jack on the bottom.
I don't think you could go wrong with either battery here. As we all know the stock one is just way to under powered. It should be mentioned to get a battery monitor app to go along with your battery upgrade. The sensation is set for 1580mAh. I'm using the free "Battery Monitor Widget", which allows you to set the mAh's to the size battery you go with for proper calculations.