If you do go with the iPhone get one of these. I have one and it is way cool!
DEXIM DCA132 Foldable Power Dock For IPhone P-Flip Foldable Power Dock. P-Flip Foldable Power Dock is world's first foldable, portable, multi-functional and rechargeable power dock. This is a desktop holder with charging and sync, and is also a rechargeable back-up battery pack for Video/Game. Charge your iPhone/iPod Touch on the go. Extends up to 8 hours Talk,15 hours Video/Game or 80 hours Music. For iPhone 3GS/3G/iPod Touch 3G/2G/1G. Capacity: 2000mA Lithium Polymer Battery Power: Battery input power: 5V DC,1A; Output power: 5V DC,1A , Compatability: iPhone 3GS,iPhone3G, iPod touch 2G,iPod touch, What's in the box: 1x Foldable Power Dock,1x Mini 5 pin USB cable 1M
Amazon sells it for $30.00
Amazon.com: DEXIM DCA132 Foldable Power Dock For IPhone 3GS/3G/iPod Touch 3G/2G/1G: Electronics