Hi, I just bought an LG 50PC5D Plasma. I want to connect it to my computer, however I`m not sure what connection to use to achieve the best quality. This TV has a VGA input so I could connect my PC using a VGA Cable but my computer also has a DVI Output so I could use a DVI to HDMI cable to connect it to my TV`s second HDMI input. What should I do

Thanks
Ryan

Try both. Check what resolution is supported over VGA and over HDMI.
In theory HDMI should be better, but in real life things maybe different.