I5 4460
I5 4460
Choose between the i7 4790(K), i7 4770(K) or an Xeon E3-1230 v3. If you can find a good deal, these options offer significant improvements. Otherwise, saving up for a CPU, motherboard, and RAM might be wiser. For the right price, you can nearly double your thread count.
It would look great with an i7 4790k, and you can push it to nearly 4.8ghz depending on the CPU.