1) Shouldn't matter too much, but what speed is that RAM? Ideally, want DDR3-1600, since its the max speed that processor will support.
2) What power supply have you chose? That will matter, especially if you plan on future SLI, although not sure what you are doing that would require that.
3) Assuming you have the rest picked out, aka case, hard drive, OS, maybe a sound card, etc?