Don't bother with mini anymore (I've been a mini user for >1 year now). Mini runs on WM2003SE while Atom runs on WM5. All new software will aim for WM5.

I'm considering switching to 838 (or wait for the 838 pro). It's bigger, but I do find the keyboard useful when texting. This is important to consider if you do a lot of English typing.

Happy Shopping.

I think both Dopod and O2 come from the same OEM, with the same WM5 OS. Major difference is more or less on the company specific pre-installed software (Dopod provides BT v2.0 while O2's BT is v1.2). But you'll likely install something like Today Manager in order to make it even more user friendly. Hence I'd say O2 and Dopod are on par with each other. Price-wise O2 is 20% more expensive. So... Eten mah... I've never tried it...