CNNMoney has released a list of the most and least affordable cities in which to live (in the United States, that is). This is something you really, really want to look at before accepting any kind of transfer. The raise they offer you might look good on paper, but in reality may amount to little more than a cost of living increase. It also doesn’t hurt that the housing market has been so topsy turvey that traditionally expensive places to live are becoming less so (and vice-versa), making it difficult to rely on traditional, word of mouth knowledge of where it’s expensive to live and where it is not.
So look at this story before you go. You’ll be glad you did. It’s completely fair to ask for a cost-of-living increase as well as a raise. Doesn’t mean you’ll get it–but it will be more likely if you’ve got some hard facts to back you up.