While 120GB is good for OS and some core programs, if you went with the 240GB drive you could use steam mover to put your top 5 games on the SSD, which makes a massive difference in games like BF where spawning early can get you choppers etc. Also gives you room to expand in the future and reduces the hassle of micro managing where you install applications to to save SSD space. Once you go SSD, you'll never go back!