Sort of in the same boat. I have a 16GB iPad 3 at the moment. I won this iPad over a year ago and 16GB is definitely not enough. I had a 32GB iPad 1 before that and passed that along to my partner. I am now considering moving on to a 64 or 128 GB iPad 4. Part of me is saying to wait for the 5, part of me is saying to get the 4 already.
Since I have an 64GB iPad mini and a 32GB iPhone 5 having the lightning adaptor on everything would be a plus and I have a really nice iPad case from Coach, that if I went with the iPad 5, would probably not work well with.
I can't imagine how much more they can add into the iPad 5 that would make me regret buying a 4. It's already faster than the 3, so that is good. As for the camera, I never use the camera on either iPad that I already have, so that is not a deal breaker. The only thing I could see that would be great would be the new form factor, but then the case I have would not work.