Re: DVI->HDMI quality issues
Double check your TV manual for the inputs. Some TV's require that you connect a PC to a certain input.
For example I have the Samsung LN450A LCD. I'm running a DVI-HDMI cable but I have to use the HDMI input 2 as it's designed for computer input. Using this input also enables me to run 1920x1080 resolution even though the tv is only a 720p.