what is the price for board shipped?
I can built computers for around $300 without monitor!
The Biostar M7VKS do not have AGP port means you can only use PCI video card. While i am not sure if you can disable it on BIOS, i believe most new games will need a better video card and most of them are in AGP only.
I ordered from wiredzone.com for a PCchips m810LMR (onboard video shared memory up to 64MB, 4 channels sound AC97 2.2, AMR modem included, 10/100 LAN, an AGP port for video cards up to GeForce 2 GTS DDR 32MB tested) for 68 max. shipped (60 + shipping max 6) Install win98se is very easy. After format drive and install Windows. Put in the mobo CD and the autoinstall program got all drivers do it steps by steps. (only need to click yes, ok and change windows CD if you have not stored them on HD)
a AMD Duron 1G is only under $50. Buy it with a AMEX BLUE and watch the price go down in 2 months to get $10 or more (or better, go will a higher CPU, more drop in price

)
cheap case for around $30, some cheap CPU HSF ($5) can be found from nexfan.com (but they are not quiet)
the rest, look for deals from hot deal forums. (get most for low price or free after rebates like mouse, keyboard etc)