Things to look for in a motherboard besides price:

Front side bus speed - rate of data transfer from processor to memory and graphics.
Slot types - AGP or PCI express. Depends of which card you want to use.
Expansion slots - PCI slots for additional cards such as sound, or network.
USB - number of ports and locations matching to case
Overclocking - yes.
Maximum amount and type of RAM - for gaming, I would choose speed over quantity with a minimum of 6 gb.