an SSD will not effect gaming performance unless it is a game that has a lot of texture and model streaming like a flight simulator.
load times will be quicker thought, if you do want an SSD i would recommend the Samsung 840.
THIS. Windows benefits from being on an SSD, photoshop benefits from being on an SSD... MMORPGs and single player games benefit from having the loading screens go away...
But if you load first in a shooter, you still have to wait for everyone else to load.