I Need A Better Office Chair

I've been looking at office chairs and I think it's time to buy a legitimate ergonomic chair.  The best ergonomic chair that I've seen would have to be either the Humanscale Freedom, Herman Miller Embody, or Herman Miller Aeron chair.

I just need something that's super adjustable, super comfortable, and not that expensive.  The options I mentioned are a bit expensive, but, then again, if they don't cost more than a few thousand dollars I can allocate the funds and feel like the money was well spent.  That's assuming the chair is actually comfortable!