Failed the benchmark miserably, so I went out and bought a bit of memory (4Gb). Still didn't quite pass so I started worrying I might have to buy a new CPU.
Until I started playing in the dark corners of my Bios.
I now have my E4400 2Ghz CPU overclocked to 2.5 Ghz.
Windows 7 64 bit
E4400 Core2Duo overclocked to 2.5Ghz (Stock cooling, clock 10 FSB 250 cores sitting about 60-70C under load 40-45 idle)
4GB DDR2 800 (Took out the 2GB of 667 I had in there so as not to slow down the new Ram)
Nvidia GTS 250 512MB
Low res score 2479
High res score 2038
So tomorrow I'm going out to buy a better cooler instead of a CPU :).
For those of you looking at upgrades, you will NOT need a supercomputer to run the game decently.