I've now owned a 500, 2000, 3000, and a 4000. I'd have to say the 3000 is my fave. I only got the 4000 recently and only played with it a couple of hours, but it felt surprisingly cheap or backwards in direction to me, not having a flicker fixer, and the case is pretty ugly. I like how sleek the 3000 is, and at the time it came out it was as pretty decent machine.
