People seem to be saying 8-10 for light use, so I'm not sure? Most of the complaints about the Dream seem to be about the battery life. Apparently the second gen one, the HTC Magic, has a beefier battery, but it came out like...three weeks ago, so there aren't very many reviews and I have yet to find one that mentions actual real-world battery life.

How are you liking your iPhone, anyway? Much as the thought of owning an Apple product makes my open source soul cry a little inside, my provider up here does those too, so it's definately a possibility.