In the past i have read that 44.69 work very well, especially when over clocking.
However the best drivers for your PC would be ATI drivers and a nice red card to go with them
I have just sold my FX5900 and I suggest that for the future of your patience you sell your FX5800 on EBay and grab the equivalent but make it an ATI brand.
I guess it depends on whether your looking for speed and quality in your drivers, but give the 44.69 a go. Or try the latest detonators from Nvidia.