I use a Sony W800 celll phone, which is also my mp3 player, reasonable quality camera and all round repository. I also use it to give me a "nudge" when I think I'll forget something I must do at a certain time, as it lives in my pocket.
Neat thing on this model is the shortcut features are programmable (sort of) so you can select as many or as few things to be one-press activated.
Find it very useful to record conversations too, again, one touch. Not all conversations, but if I'm going to scribble and talk...so far I've not been in the situation where somebody has told me a number and I've mis-written it.