simple recommendation: you get what you pay for. if you want better performance, you will have to invest some money. at least you already got a gpu, so just save some money and get at least the 6500 with a Z170 chipset mainboard (you can save some money there, not many people need 3 pcie 3.0 slots, just make sure it has a m2 slot)
edit: also wait til after xmas to buy the ram, they always increase and then drop in prices after.