In need of advice for a new PC build ( All PC guru's unite here) Need help!!

[TW1TCHYGAM3R]

Well the old Dino died about a month ago.... Well i should have killed it lol.
Its a old Dell Dimension C521:

Spoiler

CPU: AMD Athlon 64 X2 3600+ (Fried I think)
RAM 3.00 GB Single-Channel DDR2 @ 317MHz
Motherboard: Dell Inc 0HY175 (Socket M2 ) (Fried)
Graphics: ATI Radeon HD 4550 (Sapphire/PCPartner) (still works)
Hard Drives: 75GB Western Digital WDC WD80 0JD-75MSA3 SCSI Disk Device (Still works)
Optical Drives: ATAPI iHAS524 B SCSI CdRom Device (Best burner ever!!!!)

Anyways I have saved up $600 for a new build. I don't need a keyboard/mouse/monitor/CDdrive because I am reusing them. Also I am gunna dual boot Ubuntu for my Android builds on the old hard drive too.

Here's the new build (Well actually my first complete computer build):

Spoiler

CPU: AMD Phenom II X4 965 Black 3.4GHz Quad-Core Processor $89.99
CPU Cooler: Corsair H40 Liquid CPU Cooler $39.99
Motherboard: Gigabyte GA-970A-DS3 ATX AM3+ Motherboard $79.99
Memory: Kingston HyperX 8GB (2 x 4GB) DDR3-1600 Memory $36.99
Storage: Seagate Barracuda 500GB 3.5" 7200RPM Internal Hard Drive $69.98, 75GB Western Digital WDC WD80 0JD-75MSA3 SCSI Disk Device (FREE)
Video Card: PowerColor Radeon HD 7850 2GB Video Card $189.99
Case: Logisys CS2006BK ATX Mid Tower Case w/480W Power Supply $42.99
Optical Drives: ATAPI iHAS524 B SCSI CdRom Device (FREE)
Total:$549.92

Now for this PC I'm gunna be using it for Gaming, Music, school, building Android, emulators (PS2, Wii), gfx, and probably alot more!
So the big question is.....: For its price is it a good build? I live in Canada and every part is going to be bought at NCIX Canada just down the street from me.

Honestly I think im going quadcore crazy... If i buy this it will be my 3rd quadcore device which includes my HTC One X 1.5ghz quad nVidia GPU and an Asus Transformer TF300t at 1.8gh nVidia GPU. Damn well I guess I will have a device for everything.

[Eon94]

Not bad for the price you're aiming at. I'm planning on building a PC myself, with budget of about $1K (including monitor. My PC build I'm looking at is ~$850.)

[GLaDOS]

Would strongly advise to go Intel if you like easy-to-install drivers, and this is coming from someone who uses exclusively AMD parts. Just saying.

Also, that's not a bad machine, it's economy. What can you say.

But seriously. Intel CPU. Do it.