Just checking if this build is okay!

Solution
You can do way better than that for $900. You do not want a Corsair CX series for any type of rig with an Intel CPU and a dedicated GPU - it will not boot. I've seen it happen with several units. This is a rare case where I'd actually downgrade the GPU a bit and upgrade the CPU.

Try something like this:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4430 3.0GHz Quad-Core Processor ($179.99 @ Newegg)
Motherboard: Gigabyte GA-H87-D3H ATX LGA1150 Motherboard ($101.98 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory ($79.99 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk...
Hello, made a couple of changes, specifically the PSU and the HDD.
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor ($124.99 @ Newegg)
Motherboard: MSI H87-G43 ATX LGA1150 Motherboard ($84.79 @ Newegg)
Memory: Kingston 8GB (2 x 4GB) DDR3-1866 Memory ($69.99 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($79.99 @ Micro Center)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($56.98 @ OutletPC)
Video Card: Gigabyte Radeon R9 280X 3GB WINDFORCE Video Card ($299.99 @ NCIX US)
Case: NZXT H230 (Black) ATX Mid Tower Case ($59.99 @ Micro Center)
Power Supply: Antec Neo Eco 620W 80+ Certified ATX Power Supply ($65.99 @ Mwave)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($10.00)
Monitor: Dell S2240M 60Hz 21.5" Monitor ($119.99 @ Micro Center)
Keyboard: Rosewill RK-201 Wired Standard Keyboard ($6.99 @ Amazon)
Mouse: Logitech G100s Wired Optical Mouse ($16.02 @ Amazon)
Total: $985.71
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-08 16:13 EDT-0400)
 

g-unit1111

Titan
Moderator
You can do way better than that for $900. You do not want a Corsair CX series for any type of rig with an Intel CPU and a dedicated GPU - it will not boot. I've seen it happen with several units. This is a rare case where I'd actually downgrade the GPU a bit and upgrade the CPU.

Try something like this:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4430 3.0GHz Quad-Core Processor ($179.99 @ Newegg)
Motherboard: Gigabyte GA-H87-D3H ATX LGA1150 Motherboard ($101.98 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory ($79.99 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($89.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($54.44 @ Amazon)
Video Card: EVGA GeForce GTX 750 Ti 2GB Superclocked Video Card ($139.99 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($44.99 @ NCIX US)
Power Supply: SeaSonic S12G 550W 80+ Gold Certified ATX Power Supply ($80.98 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($23.99 @ Amazon)
Operating System: Microsoft Windows 8 (OEM) (64-bit) ($97.99 @ SuperBiiz)
Total: $894.33
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-08 16:14 EDT-0400)

Then you can add whatever monitor, keyboard and mouse you want.
 
Solution
Along what g-unit was saying. But you can get a 270x at that budget with the monitor as well.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4430 3.0GHz Quad-Core Processor ($179.99 @ Newegg)
Motherboard: ASRock H87M Pro4 Micro ATX LGA1150 Motherboard ($79.99 @ Micro Center)
Memory: A-Data XPG V1.0 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ NCIX US)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($79.99 @ Micro Center)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($54.43 @ OutletPC)
Video Card: MSI Radeon R9 270X 2GB TWIN FROZR Video Card ($199.99 @ TigerDirect)
Case: NZXT H230 (Black) ATX Mid Tower Case ($59.99 @ Micro Center)
Power Supply: OCZ ZT 650W 80+ Bronze Certified Fully-Modular ATX Power Supply ($59.99 @ Amazon)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($10.00)
Monitor: Dell S2240M 60Hz 21.5" Monitor ($119.99 @ Micro Center)
Keyboard: Rosewill RK-201 Wired Standard Keyboard ($6.99 @ Amazon)
Mouse: Logitech G100s Wired Optical Mouse ($16.02 @ Amazon)
Total: $932.36
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-08 16:40 EDT-0400)