Don't get any 3G tablets out there! Most of their 'Carriers' (mobile companies as we call them) use a different technology to the rest of the world that matters (and to EACHOTHER!) so you WON'T be able to easily use a 3G ipad/ipad2 here on a UK 3G contract.
If I were in the market for a tablet now I'd get the Asus EEE Transformer or Motorla Atrix, tablet/phone (respectively) one minute - laptop/netbook the next. Pretty damned cool.