So I've been dual-boxing on my desktop/laptop (no macros, no cloning... so a PITA). I've started working full time (recently graduated) so I have the time, money, and boredom to start 5-boxing on one machine.

My current setup is:
AMD Athlon 64 3400+
1 GB of RAM
256 MB NVidia Geforce 6800 GT
20" 1680x1050 Dell 2005 WFP

What I am thinking about is:
Intel Q6600
4 GB of RAM
512 MB Ati HD 4870

And I plan to get a 24" 1900x1200 screen run the main on that with the clones on the 20".

Should that setup be good?? I picked Q6600 because that seems extremely popular both here and other places I've looked but I'm not sure if I need something like the Q9450. I haven't upgraded or kept up with benchmarks/desktop technology in years (since I built my last machine) so I have no idea how much of a performance increase this would be. (it should be pretty big no?)

Also if anyone has any suggestions on cases/motherboards it would really be appreciated.