So something more like this be a good buy, in the 550-700? range
Athena - $649.00
CPU : FX-4130 (3.8GHz)
Video Card : Radeon HD 7790 1GB
RAM : 4GB 1600 Mhz DDR3
Hard Drive(s) : 500GB 7200 RPM
Power Supply : 450 Watt
Optical Drive : DVD
Do you have a link to where you are getting these parts/prices? As we have shown, there are better options in that price range.
The CPU is still an issue here, and while the 7790 isn't a bad card it looks like you can do better without spending more. And which brand power supply?
Also, is that a 1x 4GB stick of RAM or 2x 2GB sticks?
I think you should avoid 2GB sticks (which is why I discouraged the 6GB set [4+2]).
If you go with 4GB make sure it's a single stick so you can easily upgrade later to 8GB.
Adding another 1x 4GB stick is super easy, if you have 2GB sticks they will be useless and need to get replaced.
I already posted a link to another vendor with better options/pricing.
I'll reformat it similar to your post, maybe make things easier to compare.
Here's the link again to the AMD configuration I used:
http://www.cyberpowerpc.com/system/AMD_Quad_Core_Configurator
$643 - $60 Rebates = $583 .......................... $649
CPU: FX-6300 ............................................. (FX-4130)
Video Card: R9-270x (newer 7870) .................. (7790)
RAM: 8GB 1866 MHz DDR3 .............................. (4GB 1600 MHz)
Hard Drive(s): 2,000 GB 7200RPM .................... (500 GB 7200RPM)
Power Supply: 430 Watt Corsair quality brand .... (450 Watt unknown quality)
Optical Drive: 24x DVD DL R/RW ....................... (DVD ?)
One detail we don't know, is your system including the operating system? Like Windows 7 or 8? That will add to the cost of the systems. If I add Win 7 64bit to my system it will be $747 before rebates and $687 after.
It's easy to change configurations though, so you could pick a 260x (newer 7790) instead of 270x (newer 7870) and that would reduce the price to ~700-725$ before rebate $640-665 after.
One option I didn't add that may be worthwhile is the liquid cooler over the stock version. It's not necessary unless you overclock, but it should help the PC run cooler and quieter either way and is a good value for the $20 extra it costs (retail would be $40-60).
If you do plan to OC and pick the water cooler, upgrade to the 500 Watt Corsair CX for $8 more. If you don't mind another rebate, there's a 650W Thermaltake Smart unit that should be decent for $21 with a $20 rebate...essentially a free upgrade over the 430 Watt CX. That'd be plenty of power even for future upgrades.
There's also a 16x Blu-Ray burner upgrade on sale for $32, another fair value option.
But again, do you have link to where you're getting your parts/prices? And importantly does it include Windows or another OS?