First, someone please translate £300ish.
I use a VisionTek 1300 256/ddr2 AGP card (ati). On a 939 system. Seems ok except when zoomed on concentrated fires then frame rate kills. So, I avoid that in my scope now. You can drop you particle density and not tax the card with AA. But in the end unless you have an 'industrial strength' wallet - deal with the eye candy or not.