Config assistance

Long time customer. Time to upgrade two of my older desktops for teenage sons. They play mostly racing (Need For Speed style) and City Simulation (SimCity, Cities: Skylines) with some FPS. Want something quiet and small factor. Looking to upgrade monitors to dual 24 inch in future (likely 1920x1080). BluRay player for movies. Also, I'm partial to Corsair memory and WD black drives.

Here's my current thinking. Any comments are appreciated.

Saved Ticket #: 1324779

Specifications:
Chassis Model: Special Deal Hot Seller - Pre-built Digital Storm Bolt 3
Exterior Finish: Black Brushed Aluminum Hairline Finish
Side Window: Edge to Edge Premium Acrylic
Processor: Intel Core i7 6700K 4.0GHz (Codename Skylake) (Unlocked CPU) (Quad Core)
Motherboard: ASUS Z170I PRO GAMING (Intel Z170 Chipset) (Mini-ITX) (Up to 1x PCI-E Device)
System Memory: 16GB DDR4 2666MHz Corsair Vengeance LPX (High-Performance)
Power Supply: 450W SilverStone ST45SF (Bronze Rated) (Supports up to GTX 980) 
Expansion Bay: - No Thanks
Optical Drive: Blu-Ray Player/DVD Writer (Play Blu-Ray and Burn DVDs) (Slim Slot Loading Edition)
Storage Set 1: 1x SSD (250GB Samsung 850 EVO)
Storage Set 2: 1x Storage (1TB Western Digital - Black Edition)
Storage Set 3: - No Thanks
RAID Config: - No Thanks
RAID Card: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Graphics Card(s): 1x NVIDIA GeForce GTX 970 4GB (Includes PhysX)
Sound Card: Integrated Motherboard Audio
HPC Processor: - No Thanks
Extreme Cooling: H20: Stage 2: Corsair H100i GTX - 240mm Radiator Liquid CPU Cooler (Extreme Performance)
H20 Tube Color:- Not Applicable, I do not have a custom HydroLux liquid cooling system selected
Chassis Fans: High Static Pressure - Corsair Air Series SP120 Fans (2x 120mm)
Internal Lighting: - No Thanks, Front Panel LED Lighting Only
Airflow Control: Digital Storm Thermal Management Control Board & Software
Chassis Mods: - No Thanks
Noise Reduction: - No Thanks
LaserMark: - No Thanks
Boost Processor: Stage 1: Overclock CPU - Up to 4.4GHz (Depends on Cooling and Motherboard)
Boost Graphics Card(s): - No Thanks, Please do not overclock my video card(s)
Boost Memory: - No Thanks, Please do not overclock my memory
Boost OS: - No Thanks, Please do not tweak the services on the operating system
Windows OS: Microsoft Windows 10 Home (64-Bit Edition)
Branded Gear: Bundle: T-Shirt (EXTRA LARGE) + Water Bottle + Carbon Fiber Pen + Leather Keychain