Help on a $515 build

I want to build my first gaming pc and I am on a strict $515 budget. I am currently turn between two builds. I intend to play skyrim modded (with an enb). So which build would have better performance? Also leave some suggestions if you have any.

Build 1:

CPU: FX-6300                                                        119.99

Mobo: MSI 760GMA-P34(FX)                                   59.79

RAM: Kingston Blu 8GB 1600                                   71.88

Hard Drive: Seagate Barracuda 1TB 7200RPM        54.99    

GPU: MSI R9 270                                                    139.20

Case: Rosewill Galaxy-03                                          29.99   

Power Supply: Corsair Builder 500w                          29.99

Optical Drive: Samsung SH-224DB/RSBS                 14.99

Combo                                                                      -11.00

TOTAL:                                                                     509.82

 

Build 1:

CPU: i3-4130                                                          109.98

Mobo: MSI H81M-P33 V2                                          55.99

RAM: Kingston Blu 8GB 1600                                   71.88

Hard Drive: Seagate Barracuda 1TB 7200RPM        54.99    

GPU: MSI GTX 660                                                  139.99

Case: Rosewill Galaxy-03                                          29.99   

Power Supply: Corsair Builder 500w                          29.99

Optical Drive: Samsung SH-224DB/RSBS                 14.99

TOTAL:                                                                     507.80

                             

I'd take Build 1.  However, if you can get a good ATX motherboard and ATX case, it would be much betetere as the 760G is old and not really made for the FX series of CPUs.

Motherboards I recommend:

Asus M5A97 R2.0

Gigabyte GA-970A-UD3P

Asus M5A99X Evo R2.0

Asus M5A99FX Pro R2.0

ASRock Fatal1ty 990fx Killer

It's cheaper to get a 8gb usb stick and ditch the cd drive.

I don't think you'll have a playable (30+ fps) modded game with that video card but if you lower the resolution it will be fine.

Skyrim will run on high unmodded at HD resolution.