Good budget gaming build?

This will give you much better performance, the 750 was a bad purchase.
An i5 + a crap GPU will still give you poor frame rates, an i3 and an R9 380X will do you much better.
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-6100 3.7GHz Dual-Core Processor ($148.00 @ Shopping Express)
Motherboard: Asus B150M-PLUS Micro ATX LGA1151 Motherboard ($109.00 @ Shopping Express)
Memory: Kingston FURY 16GB (2 x 8GB) DDR4-2400 Memory ($96.00 @ CPL Online)
Storage: Kingston SSDNow UV400 120GB 2.5" Solid State Drive ($59.00 @ CPL Online)
Video Card: Asus Radeon R9 380X 4GB Video Card ($234.00 @ CPL Online)
Case: Deepcool TESSERACT SW ATX Mid Tower Case ($49.00)
Power Supply: Corsair CXM 450W 80+ Bronze Certified Semi-Modular ATX Power Supply ($85.00 @ CPL Online)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($129.00)
Total: $909.00
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-11-08 20:47 AEDT+1100
 
If you can spend a touch more OP.
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor ($268.00 @ Centre Com)
Motherboard: Asus B150M-PLUS Micro ATX LGA1151 Motherboard ($109.00 @ Shopping Express)
Memory: Crucial 8GB (2 x 4GB) DDR4-2133 Memory ($46.00 @ CPL Online)
Storage: Kingston SSDNow UV400 120GB 2.5" Solid State Drive ($59.00 @ CPL Online)
Video Card: Asus Radeon R9 380X 4GB Video Card ($234.00 @ CPL Online)
Case: Deepcool TESSERACT SW ATX Mid Tower Case ($49.00)
Power Supply: Corsair CXM 450W 80+ Bronze Certified Semi-Modular ATX Power Supply ($85.00 @ CPL Online)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($129.00)
Total: $979.00
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-11-08 21:25 AEDT+1100
 
I will be using the 750. I think that it is enough. Thanks