Location: Sydney, NSW, Australia
Parts Preferences: Intel CPUs, nVidia Graphics
I want my new PC to last 4-5 years, I plan on SLIing.
Not sure whether SSD is worth it plan on using it for gaming for faster load times. Playing all sorts of games, alot of sc2 and sim city.
Why Are You Upgrading: 4.5 year old computer, need a new one.
CPU: Intel Core i5 3570 - $215
CPU Cooler: CoolerMaster Hyper 212 EVO CPU Cooler - $35
With this you may want to consider doing crossfire 670's. If you have the budget why not? Also 16gb of ram is overkill for gaming 8gb is plenty. The SSD is worth it. It will dramatically increase loading speeds on your computer. If you want to do sli graphics you may want to consider getting a 750W psu as well. With cooling, you might want to get two extra 120mm fans.
The only thing that won't work here as you are thinking, your PSU. I would get a 700-800W PSU. I would get a Corsair modular PSU and that is because of the power you'll need, the quality brand, and modular so you don't have extra cables to manage. You'll only plug in the cables you need.
Also with your budget, I'd say you're doing yourself a disservice by not getting a 3570K since you already have the cooler and mobo for overclocking. You can easily, and safely, get an additional 20% clockspeed for very little additional cash. If you are concerned about using more electricity, it will still kick in speedstep at idle or browsing and not using any more juice than one that is not overclocked. You can hold off on the overclock for a year or two down the road as well if it performs well enough at stock. Just gives you more options.
I highly recommend getting a GPU with a 2- or 3-fan cooling solution. There reference (single fan blower-style) is very loud under load and has no thermal headroom.
Do you all just pay a lot for RAM? That seems kinda steep for 16GB. At any rate that looks like it may be CL10. You want CL9 (9-9-9-24), 1.5V.