My Middle School students have built a few mITX systems this last year, and 'designed' a lot more.
We would have looked at something like this:
PCPartPicker part list:
http://pcpartpicker.com/p/mF29dC
Price breakdown by merchant: http://pcpartpicker.com/p/mF29dC/by_merchant/
CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($241.98 @ Newegg)
CPU Cooler: Silverstone NT06-PRO 74.0 CFM Sleeve Bearing CPU Cooler ($53.00 @ Newegg)
Motherboard: ASRock Z97E-ITX/ac Mini ITX LGA1150 Motherboard ($121.98 @ Newegg)
Memory: G.Skill Trident X Series 16GB (2 x 8GB) DDR3-2400 Memory ($114.99 @ Newegg)
Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive ($110.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Newegg)
Video Card: Gigabyte GeForce GTX 980 Ti 6GB Video Card ($659.98 @ Newegg)
Case: Thermaltake Core V1 Mini ITX Tower Case ($40.98 @ Newegg)
Power Supply: Antec High Current Gamer 620W 80+ Bronze Certified Semi-Modular ATX Power Supply ($59.99 @ Newegg)
Operating System: Microsoft Windows 8.1 OEM (64-bit) ($99.99 @ Newegg)
Total: $1553.87
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-07-01 10:12 EDT-0400
All from Newegg and enough money for an external DVD and an additional case fan if needed. There's also enough room for a much taller CPU cooler, and with the horizontal motherboard layout, weight does not matter much.
We have built in this case, and the 200mm fan that come stock is both quiet and effective. In spite of what the note says, the GPU will not block use of the mountings for the SSD or HDD.