Getting new computer, need quality, performance

Hi all! This is my first post!
I'm getting a new computer, and I'm looking at the 1150-1300 dollar price range. I'm looking at 3 gigs RAM @ 667 mhz Kingston, 310mb graphics card nvidia 8800 GTS, intel duo core 2.33 ghz. I need to know what roles these all play in FSX. Like, does the RAM improve frame rate? That kind of stuff. And what makes the biggest difference in performance and/or quality?
I'm getting a new computer, and I'm looking at the 1150-1300 dollar price range. I'm looking at 3 gigs RAM @ 667 mhz Kingston, 310mb graphics card nvidia 8800 GTS, intel duo core 2.33 ghz. I need to know what roles these all play in FSX. Like, does the RAM improve frame rate? That kind of stuff. And what makes the biggest difference in performance and/or quality?