And what is actually so bad about unlimited plans? When you are going for a shared account it is not likely that you would need enough resources to violate the host Acceptable Usage Policy. And if you do not violate the policy you actually get what you need. I mean is there any use of paying extra dollars for those 2 Gb you currently lack if there are hosts our there that would just not meter your Disk usage? Of course they will track your resource usage and this is actually more important than space itself. So I think it is better to look for the appropriate resource usage policies policies if you are going with the shared offer.
And as for the Dedicated offers or VPSs i think unlimited is a word to fear here. This is truly a lie for a VPS or a dedicated server.