Help me on this PDA-phone issue?

i’m currently looking for a PDA-phone that has Windows Mobile as its OS. It doesnt have to be a newly-released phone on the market. i’m looking for a decent second-hand PDA-phone which is able to help me manage my schedule, remind me of essential tasks, take some decent photos, work on some office documents, etc.. Internet surfing is of lowest priority. i’ve been looking around cnet reviews and it seems like there is quite a few major problematic issues surrounding O2 phones, especially it freezing at times and its battery life. Can anyone enlighten me on the worth of purchasing O2 products?

Get the SonyEricsson P990i . its awesome .

HTC Touch P3450 – WM6 PDA Phone! TouchFLO review