Ok so I have comcast and the scientific atlanta 4250hdc. i also have a vizio 42" 720p tv. i have it connected via hdmi but am wondering how i should have the picture set. there are 4 settings, upconvert_1, upconvert_2, auto dvi and fixed, which should i pick? and when doing the hd setup what resolutions should i enable? thanks.

Ok so I have comcast and the scientific atlanta 4250hdc. i also have a vizio 42" 720p tv. i have it connected via hdmi but am wondering how i should have the picture set. there are 4 settings, upconvert_1, upconvert_2, auto dvi and fixed, which should i pick? and when doing the hd setup what resolutions should i enable? thanks.

This might be helpful ...

http://sciatl.com/products/consumers/userguidepdfs/4003114.pdf