My current system is a bit dated, but it's been a solid workhorse.

With the installation of Cataclysm my boxing performance has dipped every so slightly below my threshold of satisfaction.

I 5 box, I have no intention of running 10 anytime soon.

Hardware configuration
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Current setup is a 2+ year old XFX nvidia based chipset mobo running a non OC'd Q6600 quad core (I believe at 2.4ghz) with 8g of ddr2 memory.
Center and right monitors are driven by a BFG 280 GTX (1gb memory).
The center monitor is a samsung 23" running at 2048x1156. This is the primary window for ISBoxer.
The right and left monitors are Acer 22" displays with native resolutions of 1920x1080.
The right monitor is used for research/mumble/vent/TS/browsing/porn/etc.
The left monitor is driven by an XFX 9800 series nvidia card with 768mb of memory. It supports the 4 slave/non active windows.
The PC (64 bit Win7 Pro) is kept as clean as possible. I have a laptop running next to me which handles all that other crap that typically slows your machine down.

Software configuration
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Software used is ISBoxer using the 2 step method
I have 2 wow folders residing on a 64gb SSD, 1 for my tank, the other for the slaves.
The active window (center) has an FPS limit of 60.
Non active windows have an FPS limit of 15.

Questions/Requests for those who reply:
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1. Is 2048x1154 too large to virtually be running 5 wow's at?
2. Are there any blatent flaws of this setup or is it just getting old? I see no reason why it wouldn't stand toe to toe with any of the current high end i3's and any of the i5's currently available.

3. If you feel so inclined, I'd like to see peoples opinions regarding hardware upgrade/replacement paths. Please list the top 3 items which would increase performance.

In my opinion currently it's:
1. Replace primary video card, replace secondary video card with current primary card.
2. Upgrade memory to 12/16gb - Is Cata really that much of an increase taxing my system that much more? (although I've seen in other threads WOW limits itself to 2gb max, nonetheless, I'd be at 10gb) and 3. Processor (either OC or replace - which would mean CPU/Mobo/Memory).

I'm sure there's some tweaking that can be done. Any input is appreciated.