tenira, agp is only going out in the big-back-wad states of the good ole USA :P
here, we have just this last 2 months started to get hold of the pci express vid cards and mainboards

(west yorkshire, UK)
not worries, calendae *grins* as a girl gamer, i guess i should be used to it by now ^^
and no flames over Semprons ether. i work prety much exclusively with ether 2400-3000 semprons, or for the spenders, the 3000-3800 AMD 64 chips at work.
about the PCI-X cards.....for you in Oz, just dont bother unless you want to play everquest2 *grins* with it not looking like a reject from Spyro the Dragon (this is according to a friend that spent almost 2k in total to get his machine up to speck for the game, only to have his sata hdd's and mainboard hate each other and need to get a different board altgether cause his board was a strange beta edition)
we can still get hold of PCI old version vid cards, but that is what area of graphics cards that are winding down over hear.this year, i have only built one machine that had a pci-x card in it, and the lady that bought it wanted the gods *deleated* for a system, so spent the extra cash on the better versions of stuff.
to predict, i will say that over here in the UK, the pci-x card will take hold sometime in the next year or two, but the agp will be about for another 2-3 years, just like the pci-old was.
so, tenira, unless you wanna play doom3 aswell, at full tilt and maxed graphics, dont bother buying. specialy since you only updated last year.
best way to keep your machine working and you happy, i will say, is just to upgrade the mainboard and chip. it will be cheaper in the long run, considering that you would ned a whole new vid card if you went the way of pci-x
yeah, in the big picture version, it would be best to upgrade now to the latest stuff, but hey, that big pic, its usually seen best from USA, where they have big stuff all the time :P
and if your like me, then a machine like mine will last you for the 2-3 years that the pci-x cards will need to become household names round here.