well, you have an i3-3250 (Ivy), so pick any i7 from LGA1155 that you want and plug it in. if you need a BIOS update on your motherboard, you can do that using your current i3 anyways.
now, unfortunately, there's not much left in LGA1155 anymore, so you can maybe get an i5, but that doesn't seem worthwhile.
it's easier to just buy all new-generation (LGA1150) parts. well, at least mobo + cpu. you can likely move your ram over, and obviously reuse your hard drives and power supply and whatever.