Yep, try the 2 V2's in SLI.
Heheh, sometimes this community amazes me. "What, you need a second V2.... here!" LOL. Not only do we give advice on how to get the game running, but parts too! You guys rock.
BTW, the bottleneck here would seem to be memory bandwidth. By going to 2 V2's in SLI, you will be doubling your video memory bandwidth, and it should give you a nice bump in framerate. After that, it may come down to CPU... AH is heavily dependent on floating point operations in the CPU.
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Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com 
"My P-47 is a pretty good ship, she took a round coming 'cross the Channel last trip.
Just thinking 'bout my baby and lettin' her rip, always got me through so far."
- Steve Earl