If you want a lot and no one provider is going to give you what you want all in one place. Personally I would get the computer at Dabs.com savastore.com or ebuyer.co.uk
As for the printer. Anything from canon would do you for casual stuff. But you never made any specifics.
As for hand held what do you want from it. I have a Palm treo and it is a PDA and phone in one plus acts as my mp3 player away from the car and home. Reasonable handheld for my mum would be anything up to 10 years old but we dont know you from adam so care to enlighten us more to what you want to do with all 3 items. Big screen doesnt say much some would say 17inches is huge but others over 21 is vital!