i5 i7

Hello guys :) . I am thinking of an upgrade for my system. My pc is old has an i5 2400 processor but i have an rx 480 4gb with 12 gb of ram. I am not earning so i have some budget. i was thinking of upgrading to i7 3770 but it is too pricey for me at £70 (UK). I am not going for the K versions...