Sorry, no dice for 1080i. I would recommend using AntiAliasing on 480p. 2x Quincunx should improve your picture pretty well. 4x Gaussian is the best, but only use that if you have the spare memory. You won't notice anything but a framerate drop with debug info on. So if you want to notice the difference AA makes turn debug info off.
Can we have the 2 release threads merged, pretty please?