I don't know much about the Samsung and Sony Ericcson models, but a couple of guppies on here rave about the Nokia N97... and tbh i quite like it now... still don't think it's as good as the iPhone, but it's pretty up there for me now. Here are some pros and cons of the N97 i listed in another thread:
*Pros: *
- Good spec,
- Massive storage of 32GB of storage (expandable to 48GB),
- Good connectivity,
- Decent keyboard,
- Long battery life.
*Cons: *
- Crappy touch interface design,
- Applications are not optimised well for touch, camera is 5mp but pics come out looking crappy at full crop,
- Media playback features seem underpowered; the N97 has some good hardware, but can't quite manage the interface and apps to handle all that power
theres a smaller N97 called the 'mini-n97' being launched next month... the bigger one has a crappy touch interface, its a capacitive screen, as opposed to a resistive one that the iphone uses...