Sometime later this year I intend to build another PC,hopefully a reasonable high spec, but for now I just want to upgrade my agp radeon 9800 pro.Don't want to spend more than a 100 quid,hopefully less.Quite like the Nvidia 6600 but all advise welcome. Thanks.
you would notice any major difference between the two cards - I just replaced a 9700pro with a 6600GT (I just wanted a replacement due to the failure of the 9700) and there is very little (if any)performance change.
If it was my money I'd hold onto it and save up for something a bit better.
The diifference is not huge between the two cards and is most noticable at the higher resolutions and with antialiasing/anisotrophic filtration applied.
One reason why it might be worth updating is the support for pixel shader 3.0 that the 6600GT has....so you could use the latest HDR effects (but bear in mind the 6600GT is not really powerful enough to make full use of these effects)
Better to wait and put the cash towards the new pc.