You can get faster RAM, you can get cheaper RAM. What's your goal for your system?
Overall.. I need a system to play CS 1.6 (Dedicated gfx get atleast 60fps.. so it doesnt take much to get the perfect 100) I'd like to expand to some other games.. but that isn't important right now.
Basically.. CS, Photoshop, Dreamweaver, ect.. I chose the 6400 so I could learn more about overclocking.. reading about it... just isnt the same