Looking for help with upgrading

[Mackarino]

Hey, I'm looking for some advice on what I should upgrade in my computer. The only game I
really play is WoW, and I'd prefer to play it on higher settings while still maintaining
around 60 fps.

I play at 1920 by 1080 resolution.

Budget: $500

Country: Canada

Here are my current specs:

It was a prebuilt PC, so I couldn't find the Mobo or Ram on Newegg, but they are both listed somewhere under the Mobo link, aswell as the Hard Drive.

Mobo - MS-7613 (Iona-GL8E) http://h20000.www2.hp.com/bizsupport...odTypeId=12454
CPU - Intel i5 760 @2.8GHz http://www.newegg.ca/Product/Product...82E16819115067
Ram - 4x2GB PC3-10600 MB/sec
GPU - MSI GTX 660ti http://www.newegg.ca/Product/Product...82E16814127696
PSU - RS500-PCARD3-US 500W http://www.newegg.ca/Product/Product...82E16817171031
Storage - Seagate Barracuda 7200.12 ST31000528AS 1TB http://www.newegg.ca/Product/Product...82E16822148433
- Kingston Sv100S264G http://www.newegg.ca/Product/Product...82E16820139415

The Windows 7 is OEM, and seeing what people have said in the past, upgrading my Mobo would require me buying a new key?

I've upgraded the PSU and GPU in the past as well as bought the SSD, but if I need a new PSU I'd be fine with upgrading it.

Basically, I'm wondering what people think I should upgrade? What would give me the largest
performance increase in WoW in a raid environment.

From what I've read over the past couple days on this forum, there have been a lot of
Mobo/CPU/Ram suggestions to people, would that be the same for me?

Let me know what I should replace and what I should keep.

[Toffie]

This is all you need to maintain decent FPS in raids/large battlegrounds with every single setting turned on max.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($226.99 @ Newegg Canada)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($28.33 @ DirectCanada)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($139.99 @ Newegg Canada)
Total: $395.31
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-03-18 23:39 EDT-0400)

I take it you know how to overclock? Else you might wanna follow this guide:
http://www.youtube.com/watch?v=iCmceMAUn3Q

[Mackarino]

Alright thanks for the response, I'll look into getting those.