Cregan you have an FX5700 graphics card and your supprised your rates are low?? Really are you really supprised??? dude please throw that ancient piece of crap into the bin and get something of a more substantial nature.
I had a 6800 Nvidia for the demo but soon realised that it would not do so the best AGP card i could was the x1950pro 512mb for 150 pounds UK and now the game runs fantastic.
xp2800+ CPU and 1Gb of Crucial RAM here so go get yourself a new vid card mate. Planning to upgrade mobo, cpu and ram in the VERY near future
Also i have noticed alot of you are trying to decrease your setting to such a low rate to get good fps. Going low is an option for some older graphics cards but newer graphics cards to work for their money, crank some of those settings up so your card is doing some work. view distance not set to over 2500 and no AA or Shadows, and nothing over normal and you should be good to go.
Run Tune Up 2007 on your computer, and adaware SE Plus, Spybot search and destroy and then run a defrag and you will blistering around in ArmA in no time