Another idea - before you spend $ on hardware upgrades - might be to install and try Linux. I have a E8400 dual core (3ghz), 8 GB ram (ddr2-667), GeForce 8800 GTS videocard (512mb), Asus P5N32-E SLI+ motherboard , 2x 320gb samsung HD and 2x 24 monitors, which sounds similar to your specs.
I haven't reached any 60+ content in the game as I'm brand new, however I have installed a Vista 64 bit on the same machine to compare. My findings are really simple. My 5 team groups runs way smoother on Linux (32 bit) than on Vista. On vista I have to run 4 alts on the lowest settings and the main on medium, and when I arrive in a crowded place I often get lag. Under Linux I can run my alts with medium settings and full throttle on my main, without getting any lag, ever (on a side note: I didn't go through the trouble to benchmark it, what I see with my eyes & my playing experience in terms of lag is enough for me).
Setting up Linux (I use opensuse 11.0 with kde 3.5 myself ) is very easy and straightforward nowadays. The more cause you no longer have to worry about security as you have to on Windows. Or at least way less. I realize that changing your OS is a big step, and it requires a willing-to-find-this-thing-out kind of mind.
I have tested AHK & Keyclone and they both work (however I use xdotool for my keybroadcasting). I don't use/like maximizer though.
Long story short: before spending the $ on hardware, trying out Linux might be a viable option.
How are you running WoW on Linux? WINE, VMWARE or other Virtual Machine?
Maybe you could post in another thread about how to set WoW up in Linux.
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