Ubuntu :: Synchronize Email - Calendar And Tasks Between Thunderbird And Smartphone Device

I have been struggling to set up and learn to use an efficient way of task & event management. At the moment, I use Thunderbird+Lightning with Gmail (IMAP) and it works OK. I would like to add a smartphone to the equation - I know it isn't cheap and I'm expecting to pay anywhere between $100 and $500 for one - since my old phone is slowly dying anyway and I need this to work for... well, work. I would like to be able to synchronize through bluetooth or wireless at home or whenever the phone gets near my laptop, as well as (if possible) whenever the phone gets near a wireless access point. I don't want to use 3g or any similar services. I have had no luck googling so far.

I have tried synchronizing with Google Calendar, only to be disappointed by the fact that it doesn't support tasks. I think the distinction between tasks and events is an important one and it keeps my calendar organized, so I'd hate to have to give it up. I haven't chosen a phone yet, so I can adjust my choice to whichever brand or type (or OS) is best suited for what I need.