Got $500 to upgrade gaming PC, help

In 2010 I didn't know much about building computers. So what I did was buy a pre-build and added a new PSU and Graphics Card. Now I have around $500 to upgrade it.

**My build right now:**

* Processor

2.80 gigahertz AMD Phenom II X4 925

512 kilobyte primary memory cache

2048 kilobyte secondary memory cache

6144 kilobyte tertiary memory cache

64-bit ready

Multi-core (4 total)

Not hyper-threaded

* Motherboard

Board: FOXCONN 2AB1 1.00

Bus Clock: 200 megahertz

BIOS: American Megatrends Inc. 6.04 09/07/2010

* Ram

8GB DDR3

* Hardrives

Hitachi HDS721010CLA332 SATA Disk Device (1000.20 GB) -- drive 0, s/n JP2940HD2M1RAC

INTEL SS DSC2CW120A3 SATA Disk Device (120.03 GB) -- drive 1, s/n CVCV203502UB120BG

* Video Card

NVIDIA GeForce GTX 460 768mb

* Power Supply

500W I think

* Case

http://imgur.com/C7HBrRs

* OS

Windows 8 Professional

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As you can see from all this, I don't really have an upgrade path, so I wanted to upgrade the processor, cpu, and video card (and whatever else is necessary).

**What I am thinking about doing (just ideas)**
[PCPartPicker part list](http://pcpartpicker.com/p/1joXO) / [Price breakdown by merchant](http://pcpartpicker.com/p/1joXO/by_merchant/) / [Benchmarks](http://pcpartpicker.com/p/1joXO/benchmarks/)

Type|Item|Price
:----|:----|:----
**CPU** | [Intel Core i5-4670K 3.4GHz Quad-Core Processor](http://pcpartpicker.com/part/intel-cpu-bx80646i54670k) | $199.99 @ Microcenter
**Motherboard** | [ASRock B85 Pro4 ATX LGA1150 Motherboard](http://pcpartpicker.com/part/asrock-motherboard-b85pro4) | $85.98 @ SuperBiiz
**Video Card** | [EVGA GeForce GTX 660 3GB Video Card](http://pcpartpicker.com/part/evga-video-card-03gp42666kr) | $244.99 @ Amazon
| | **Total**
| Prices include shipping, taxes, and discounts when available. | $530.96
| Generated by PCPartPicker 2013-07-22 12:24 EDT-0400 |

or

[PCPartPicker part list](http://pcpartpicker.com/p/1b8mr) / [Price breakdown by merchant](http://pcpartpicker.com/p/1b8mr/by_merchant/) / [Benchmarks](http://pcpartpicker.com/p/1b8mr/benchmarks/)

Type|Item|Price
:----|:----|:----
**CPU** | [AMD FX-8350 4.0GHz 8-Core Processor](http://pcpartpicker.com/part/amd-cpu-fd8350frhkbox) | $179.99 @ Microcenter
**Motherboard** | [ASRock 770iCafe ATX AM3+/AM3 Motherboard](http://pcpartpicker.com/part/asrock-motherboard-770icafe) | $62.55 @ Newegg
**Video Card** | [Asus GeForce GTX 760 2GB Video Card](http://pcpartpicker.com/part/asus-video-card-gtx760dc2oc2gd5) | $259.99 @ Amazon
| | **Total**
| Prices include shipping, taxes, and discounts when available. | $502.53
| Generated by PCPartPicker 2013-07-22 12:28 EDT-0400 |

**So here are my main questions**

* Do I go with the AMD or Intel Processor?

* Do I get an ATX Mobo or mirco ATX

* 760 2GB or 660 3GB or something else?

If you want to change my build completely, feel free. I'm not the best at this so any help would be amazing!