If you can live without an iPad for a while, then get the iPad 5. Desperate? iPad 4.
But honestly, with the new iPad Mini coming out I don't think the iPad 5 will be much new. What would I do? Wait. And if the 5 doesn't seem much different except a bettter screen, then I would just get the iPad 4 because it would be cheaper then. And i would be keeping my iPad 2 until then.
sounds good enough thx.