It's fine to use more than one display if your graphics card is designed to run more than one. If you're losing quality through the HDMI cable then check that the picture is exactly the same size as the screen - sometimes HDMI has scaling issues with PCs. There may be an option to address this in the graphics card's software - there is with NVidia and ATI/AMD cards. Better still, connect it with a DVI lead instead if you can.

You're only running 2D software so most reasonably ok cards can handle this well - it's 3D gaming with modern games that makes your graphics card work hard.

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