Overall it should be a good budget gaming board.
It does not appear to have an AGP slot however, but a x16 PCI-e slot and a X! PCI-e slot with two further PCI expansion slots.
It uses Socket 775 so the cpu you already have wont fit.However it supports all socket 775 Celeron and P4 cpus and some (but not all) of the intel Dual Core processors.
Review click here
Now to the onboard graphics.....the Radeon X300 based graphics are much better than most onboard types,BUT they are only borderline for modern games.Have a look at this review of a similar board with the ATI 200 chipset/x300 onboard graphics click here and this pge in particular click here
They managed to run the Source engine...So HalfLife2 is possible and Need for Speed Underground 2 with the onboard graphics.
Your choice of motherboard would be a good base on which to build a budget gaming system and the onboard graphics are good enough to allow you to at least play any game you want(at lowish settings)which ,from your other posts,I see your current setup certainly wont do.