Hi, I see you're a newcomer. Welcome to tomshardware!
Down to business,
I would recommend you getting at least and i5-2500k , or even better, an i5-3570k, with a 560 or a 550ti to play crysis 3 on medium settings. I would also recommend getting at least 8Gb of RAM, hopefully at least ddr3 1333Mhz. Also, I would recommend either seagate or western digital for hard drive. What's your budget?