I'm in the market for a computer around $700-$900... But I don't know a whole lot about graphics cards. I want the computer to be able to play Runescape on medium-high settings. I know about all the other specs, but graphics cards confuse the hell out of me. Which ones would be reasonable for the price range?

ANY modern Windows 7 or 8 machine will happily support high quality graphics on runescape as it's not a demanding application.

I would like to mention maybe go a bit above for graphic cards as the game could change their needs as they produce expansions. I have had that happen with other computer games. Write down the specs needed for the game and talk to the tech building your computer

Here are your system requirements and suggestions for runescape 3.

RuneScape 3 System Requirements and RuneScape 3 requirements for PC Games (http://www.game-debate.com/games/index.php?g_id=7253&game=RuneScape%203)