Are you wanting to spend the best for your Buck?
And is £40 around the price you want to spend,
I have used a 5200 9200 5500 5550 9600 5600
but the difference in performance is worthy for 5600 9600
but not great.
There is a great increase in the more modern styles x class x600 is equal to a good 5600
but x800 6600 and x850 are vastly better
the older equivalent is a 9800
I am putting my old 9800 pro in my sisters PC or you would have had dibs,
my mum and dads PC has a PCIE5550
its ok but Battlefield 2 demo is a bit chunky looking.
It may sound a long way round but changing to a PCIE motherboard gives far better performance by using better bandwidth and other odd sounding stuff,
and pcie gfx cards are cheaper than agp equivalents.
SAPPHIRE - RADEON 9550 256MB AGP
http://www.pcworld.co.uk/martprd/product/seo/468869
so £40 @ PC World lets say you had a member of the family who worked for the NHS
this would get you 5% off
NHSDIS3107
but the £50 play is far better.
Any queeries and i'll respond, although to the dude who likes the movie watching etc homerpovey there is a fx5600 with allinone analoguetv for about £33 knocking about if you can google it.