I'm thinking of getting a second iPad to complement my iPad 2, which I like a lot. I have a lot of poorly supported apps on the iPad 2 (which runs 5.1) that I absolutely can't afford to have break when iOS is updated, and I want a second iPad anyway, so I'd like to get a refurbished iPad 3 or 4. (so at least I can use it as a test environment to make sure my apps don't break with new OS updates, plus the retina display would be nice too) The sticking point is the iPad 4's price - plus the fact I'd have to invest in a new connector. But the iPad 4 is supposedly faster than the iPad 3, and I'd like that for the art applications I use. How much faster *is* the 4? Or would I be fine with a refurbished 3, which is about $60 cheaper than the refurbished 4?