What Should I buy out of these 3? HELP PLZ

^+1, it's the build that makes most sense.

If you can though, I suggest asking them to throw out the 840 and replace it with a Vertex 4, Crucial M4, or Plextor M5S.

Ask for the low profile version of that Vengeance RAM too.

You save around ~$100 if you DIY btw. 😛
 

Yeap~ DIY FTW...! 😍 😍 😍