I'd like to post that I feel I found the best possible image quality for ZSNEXBOX when used on a standard definition television.
I hated interpolation on the PC but I decided to try it anyway. I found interpolation with no scanlines, and a flicker filter of 1, and bilinear drawing to be the absolute best. It's not the sharpest, but it's close, and there is NO flicker ANYWHERE. I used the ULTIMATE flicker test, the title screen to Super Mario All Stars (where it says PRESS START or whatever). I really do believe this looks the best. Previously I felt simple2x with a flicker filter of 3 looked best. But it was always a little boxy.
People can post their opinions on their findings if they wish.