Gaming Build on a Budget; I need some help.

[whiteis]

Over the next 2 months I will be gutting my computer and building a new one, I will be harvesting some parts from my current computer but I would like some help picking out the other pieces i need that will maximize my gaming potential for under $500

I have read a few guides and they all include parts that i am taking out of mine so I figure maybe ask here and get some tips on better stuff for a little more money.

What I have-
GPU- His 6790 IceQX 1gb
PSU- 500 watt (ocz modxstreamer-pro 500watt)
Disk drives

What I need-
CPU- Something to handle the load my old Q6600 doesnt anymore
MOBO- Good spacing on stuff, cant take my ram out atm because gfx card X0
Case- I am feeling a full size case, mine as it sits is way too cramped as a mid tower.
Ram- I would like 6-10 gb if i can find on sale
HDD-At least 500gb as i have some spares i can use with it.

If i missed anything please lmk. But for the parts that i need I will have $500, cant depend on any sales as its coming from paychecks/tax return and scattered buying.

Thank you in advance!

Edit- Added what type of psu i have already. And would intel not be better for gaming or have i been missing something? thank you for quick responses

 

[navask01]

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Amazon)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard ($92.99 @ NCIX US)
Memory: G.Skill Sniper 8GB (2 x 4GB) DDR3-1600 Memory ($73.98 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Case: NZXT Phantom (White) ATX Full Tower Case ($103.99 @ Newegg)
Total: $440.93
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-17 12:02 EST-0500)

 

[Transmaniacon]

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD Athlon II X4 750K 3.4GHz Quad-Core Processor ($80.98 @ Newegg)
Motherboard: Gigabyte GA-F2A88X-D3H ATX FM2+ Motherboard ($87.99 @ Amazon)
Memory: G.Skill Sniper 8GB (2 x 4GB) DDR3-1600 Memory ($73.98 @ OutletPC)
Video Card: Gigabyte Radeon R9 270X 2GB Video Card ($204.98 @ SuperBiiz)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($55.99 @ Mwave)
Total: $503.92
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-17 12:09 EST-0500)

Here is what I would go with. Use your current HDDs for now, and maybe upgrade to an SSD later on for your OS/Apps. Definitely figure out what brand that PSU is, you may need to budget a little more ($50) for something. You mentioned a full tower case, but I don't think you should spend 20% of your budget on a case. This HAF 912 is pretty roomy for a mid-tower and you shouldn't have any trouble fitting whatever you want in it.

 

[whiteis]

Added what type of psu i have already. And would intel cpu not be better for gaming or have i been missing something? thank you for quick responses

Also not worried about GPU mine can still dish it out untill i can get some more money after this build.

 

[Transmaniacon]

You don't have the budget to go with an i5, AMD will outperform the comparable Intel offerings. That PSU should be fine.

 

[Onus]

I like Navasco's CPU/Mobo choices much more than Transmaniacon's, but definitely agree with the latter about the case.
The R9-270X is a nice card, but considering what you've got now, I believe you would be satisfied (especially temporarily) with a GTX650Ti Boost (4 tiers higher than what you have) such as http://www.newegg.com/Product/Product.aspx?Item=N82E16814162132 . If your concern over the case was mostly due to poor cable management, you may find the NZXT Source 210 acceptable, for only $40: http://www.newegg.com/Product/Product.aspx?Item=N82E16811146075 .