I'll be a little different. If 3G will make life more pleasant buy it now. You can always sell it if a significantly better model is offered.
Too many times I have put off buying things because they may be better/cheaper and then put them off again.
This year I have been trying to rectify this by buying things I have wanted for ages and certainly can afford easily. So far the score is 6/1. Six items that I actually take pleasure in using and one that I think what did I buy that for
Helen