I use a lot of devices...
I have a server at home (atom desktop), to sync what I can't find reliably or freely enough on the cloud (it's also my media center and the "family" computer to check for quick things, as it's always on).
Then I use a full desktop when I'm "doing" things (photoshop, coding, writting, encoding, etc...).. That gives power and comfort at a decent price.
When I'm on the move, I use a netbook, because I need the keyboard (coding, forums), and because it's dirt cheap. It fits anywhere, has usb ports and card reader. I wish I took an Amd one for the hdmi out, but I wouldn't use it much anyway.
And all the time, I keep my phone.

It's not trendy, but desktop + netbook is really the most convenient AND inexpensive setup if you 1) don't need power on the move (just one powerfull notebook), and 2) don't just consume content (TV + tablet)