Low Budget Upgrade to PC (Mainly MMO Gaming)

[swingline2008]

My current rig I purchased in 2008. I am looking to upgrade the motherboard and processor, with the best bang for my buck.(Range $200 and under)
Possibly a case for better air flow and more space. I will include the current system parts that I am looking to upgrade.

Current System:
Motherboard: Pegatron AM3 Micro ATX
Processor: AMD Phenom 2x4 910 2.6ghz
Ram: 8gb DDR3 PC3-10600
Case: Mid-Size ATX Case

I've looked at the Pentium G3258 but I am concerned because I have already installed Windows 10. And from what I read it isn't worth it unless it can be overclocked.

 

[swingline2008]

Any recommendations?

 

[turbopiki]

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-4160 3.6GHz Dual-Core Processor ($111.99 @ B&H)
Motherboard: ASRock H97 Anniversary ATX LGA1150 Motherboard ($71.89 @ OutletPC)
Total: $183.88
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-08-22 22:26 EDT-0400