External preview - DVI to HDMI

Hi,
In order to obtain the best possible quality of external monitor preview - is there any difference between DVI to DVI, HDMI to HDMI, or DVI to HDMI connection or it`s just the same? Also, I`m considering to buy Palit 1GB RADEON HD 4870 video card (http://www.dclstore.co.uk/desc-palit-1gb-radeon-hd-4870-sonic-pci-e-2.0-dual-edition-retai l-xae-4870s0502-pm9248-pid-2516.aspx). Good choice or not?
thanks
Dejan

You can use the HDTV as a seond monitor and try to create a screen layout where you have the payback monitor on the HDTV and the rest of your screen layout on the first.

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