I usually obtain better quality by rendering 4 times larger than final size WITHOUT antialiasing, then resize down 4 times in Photoshop (Photoshop built-in options can do it well, plugins like Genuine Fractals can do it even better).

Don't think that rendering 4 times larger takes much more time: since you are rendering without AA, the render times are fast - I am of the impression that actually sometimes they may be even faster.