Depending in what you are going to play, won't worth it, just a 120GB SSD is $69 and the best G.Skill 8GB 204-pin DDR3 single slot RAM is $53. Total: $122 without shipping... You can trade the CD drive for a SSD bay and have both the HDD and the SSD, but it would cost even more. It's your money, thought.
BTW, gd luck