I'm planning on building a pc and spending as little as possible and still get what i need from the machine. i planned to get a g3258 and a gtx 750ti and 4gb ram. is it safe to buy 4gb now and buy another stick later? or a 8gb kit is the safest thing to do? ram kits are so costlier in our countries btw and i'll use this pc to play csgo most of the time.