hi piers
ok your pc isnt as fast as some of todays however in this case it may work in your favour,this will mean the graphic card you require will not have to be one of the fastest agp cards,since if we do select one of the faster agp cards it may cause bottlenecks as the card will be significantly faster than the cpu and this would cause lag and stuttering in games
as you can see you require a x4 agp slot,however i would be far happier if i knew your motherboards make and model,since then i could be sure which type of agp interface you have(agp 1.5v or agp 3.3v)
for now i will go with the 1.5v spec as this is what most agp cards are compliant to
as you have limited budget we shall keep cost down to around £60
1)graphic card..agp cards have begun to dissapear as the pci-express cards get better however there are still some excellent and cheap agp cards to choose from
for you i have recommended 2 and the first card is the "nVidia GeForce FX 5200 128MB DDR - AGP "( http://www.aria.co.uk/Products/Components/Graphics+Cards/AGP/nVIDIA+GeForce+FX+Series/nVidia+GeForce+FX+5200+128MB+DDR+-+AGP?productId=7883) which at around £20 represents excellent value
ok its specs are not amazing but in comparison to your p.c it should work fine,and this card also supports pixel and shader model 2.0 so it will run the vista aero interface aswell as some modern games
another decent agp card is the ATI Radeon X1650 Pro 512MB AGP ( http://www.aria.co.uk/Products/Components/Graphics+Cards/AGP/ATI+Radeon+X1600+Series/ATI+Radeon+X1650+Pro+512MB+AGP+?productId=29190) and to be honest this is the card i would recommend you get
it has some excellent specs including a 500mhz core clock and 512mb of ddr2 memory running at 400mhz or 800mhz ddr effective
however with most agp cards costing around £50 including delivery and vat i would recommend you go with a motherboard bundle upgrade
a motherboard bundle is a motherboard with a processor pre-fitted so all you need to get is some memory and you can use your existing hard drive and dvdrw or cd rom
the AMD Athlon 3200+ processor and ECS GS-761 Motherboard Bundle( http://www.misco.co.uk/applications/SearchTools/item-details.asp?EdpNo=341741&CatId=2956) is only £48 and with some compatible memory( http://www.misco.co.uk/applications/SearchTools/item-details.asp?EdpNo=236207&CatId=3178) in the shape of a 1gb generic ddr sdram module and you have a pc basis of a system thats around 10 times more powerful than your current pc
and with this motherboard you get a pci-express x16 graphics slot so gone are the slow agp card and you can now buy some of the superior pci-express cards
and as pci-express cards are significantly cheaper than the agp cards this investment will save you money over a few years
in all this will cost around £90 and then if you want a mid range pci-e card then say around £180
any problems let me know
good luck mate !