Eastman makes a decent saxophone. I would definitely take it to a quality repair tech and let them have a look at it before you just decide to drop for a new horn. Especially if you otherwise liked how it played. Its possible that it was never set up properly to begin with. Every new saxophones (regardless of brand) should be set up properly by an expert repair tech to begin with.

Also, there's no reason why the left hand pinky keys on an Eastman would be more or less susceptible to getting bent than on any other saxophone in the same price range. If you don't remember bumping it or otherwise bending those keys, you may want to check the fit in the case. ALso, has any one else borrowed your instrument? It doesn't sound like a new horn is the right anwser. I recommend getting the one you have into proper regulation and then being sure to take very good care of it.  Best of Luck!!

Cheers,
     Mark Overton
     www.saxquest.com