I know how you feel. 8 years ago I bought a car, it was top of the line, the most expensive model, it had everything, heated leather seats, power sun roof. And After I bought it, the very next year. The manufacturer added GPS to the exact same model for the same price. I tried to go have it installed by them, but they said it would cost $2000 to have it installed. They screwed me over bad. Since then I've never bought a new car, so I know exactly what I'm not getting.
My suggestion for you to not get screwed over by apple is to wait until the 2013 iPad comes out, then buy the 2012 model, and you'll know what you're not getting, and never plan on updating your OS. That way you won't get that "I'm getting screwed over feeling"