Many graphics cards on the market are designed with gaming usage in mind although they do offer good desktop application performance as well.
The GT 630 cards give you good desktop application performance, the cards are silent (dual & quad PC's only) and are able to support DVI or VGA connected monitors.
Choose the Quadro 400 upgrades and you will also get cards which can fully support both DVI or VGA monitors, they are professional class cards rather than gaming and tend to have more stable drivers giving better overall performance.