Good gaming/entertainment computer build for around $600

[alzza]

I want to buy a new computer but only spending around $AU600 for a new build that is good for media and gaming.
I won't be playing hardcore graphical games like Battlefield 3 and Crysis 2. I will only be playing games like Sleeping Dogs, Dota 2, Mirrors Edge, and Aion. Also i watch a lot of TV Series' too. Anime hehehe.

Here are a few of my current specifications:
CPU - AMD Athlon 64 X2 Dual Core Processor 6400+
RAM - 8GB DDR2
GPU - NVIDIA Geforce GTX 260
Motherboard - GA-MA770-S3P

I have heard that some people have said that my current build is decent but it is just that my CPU is bottlenecking. My computer seems to be overheating a lot when gaming and my Power Supply makes a loud rusty noise when it starts up but then it stops in a few minutes. If i should buy a new and better CPU then which CPU is compatible for my motherboard?
Also, i want to be able to record games in full HD with fraps with no lag too.
If you think my current specifications will be outdated soon then give me a good build with pricing

Thanks to all!

 

[alzza]

I don't need a monitor, keyboard and mouse in my new build. My current ones are very good at the moment. Also i don't need a Windows CD since i use everything cracked these days...

 

[Guest]

I wouldnt advertise that you bootleg. For that little will be hard pressed to have a descent pc, your better off putting that money towards a descent laptop with slightly better specs than your desktop goal.

 

[Despot96]

Your motherboard is rather old.. its AM2+ socket. It will be good for you to get new motherboard like AM3+ MSI 970A-G46 also to change CPU and RAM. Get motherboard i suggested with Phenom II x4 965BE ; 2x4GB Corsair Vengeance ; HD7850/70. Also what is your PSU brand name?

 

[dency45]

you could use this as reference. http://www.tomshardware.com/reviews/gaming-pc-overclocking-pc-building,3273.html

I can play Sleeping Dogs (high settings ) and Dota 2 (max settings ) with 1680 x 1050.
I have intel G630, 4GB RAM (1066mhz) and Sapphire HD 7770 OC.

 

[dency45]

Also, i want to be able to record games in full HD with fraps with no lag too. "

if you want that you need a quad core. lol recording with fraps really lowers the fps.