So from what I am finding, the aopen website does not have specs for their own board, It appears that board is ddr pc3200 memory so the memory you have chosen will not work. Run CPU-Z
which will tell us what ram you are running, the socket type of the board. Do you know if it has pci-e for the graphics card you want? I am still looking for more info on that board.
As Salty said what is your budget? You may be way better off going for a new mb, cpu, ram and gpu than trying to get stuff for the oloder board you have.