What components should I get?

[BlueFury]

bro... runescape can be played on any GPU, it just depends on your browser
i'd strongly suggest Google Chrome, its the best one out there for flash/java games
you should get a PC in the 500-800 price range , so you wont regret it when you cant run COD or BF

EDIT: to run Amnesia or Penumbra smoothly, you wont need a high end PC
I have a notebook too, it has a Core 2 duo 2.0ghz and a GeForce GT 540M
that one can also run amnesia smooth, it was only 300 bux

*Sorry as I know a lot of you may not know much if anything about the game RuneScape.*

LOL, we all played it once