Here you go. If you can't build your own, at least let someone else do it for you. Those prebuilt retail systems are junk and way overpriced. This will be much better for you.
http://www.cyberpowerpc.com/system/INTEL_i7_SFF_Configurator
CASE: Raidmax Hybodus mATX Gaming Case
CPU: Intel® Core™ i5-6600K 3.50GHz 6MB Intel Smart Cache LGA1151 (Skylake) [+116]
FAN: Corsair Hydro Series H60 120mm Liquid CPU Cooling System w/ Copper Cold Plate [+20] (Single Standard 120MM Fan)
HDD: 240GB Intel 535 Series SATA-III 6.0Gb/s SSD – 540MB/s Read & 490MB/s Write [+50] (Single Drive)
HDD2: 2TB (2TBx1) Western Digital Caviar Black SATA-III 6.0Gb/s 64MB Cache 7200RPM HDD [+166] (Single Drive)
KEYBOARD: AZZA Multimedia USB Gaming Keyboard [+6]
MEMORY: 16GB (8GBx2) DDR4/2800MHz Dual Channel Memory [+69] (ADATA XPG Z1)
MONITOR: 24" Widescreen 1920x1080 ASUS VS247H-P 1080P (23.6" Viewable) 2ms LED Backlight, DVI, HDMI Input [+169] (Single Monitor)
MOPAD: Corsair Gaming MM200 Mouse Mat - Standard Edition PN:CH-9000079-WW [+14]
MOTHERBOARD: GIGABYTE GA-Z170N-GAMING 5 ITX w/ USB 3.1, 1 PCIe x16, 2 SATA Express, 6 SATA3, 1 Ultra M.2 [+92]
MOUSE: CyberpowerPC Standard 4000 DPI with Weight System Optical Gaming Mouse
NETWORK: Onboard Gigabit LAN Network
OS: Windows 8.1 Pro (64-bit Edition) [+135]
POWERSUPPLY: 600 Watts - Standard 80 Plus Certified Power Supply - SLI/CrossFireX Ready
SERVICE: STANDARD WARRANTY: 3-YEAR [3 Year Labor, 1 Year Parts] LIMITED WARRANTY PLUS LIFE-
SOUND: HIGH DEFINITION ON-BOARD 7.1 AUDIO
SPEAKERS: Creative Inspire T3300 2.1 Speakers System [+49]
VIDEO: EVGA Superclocked ACX 2.0 NVIDIA GeForce GTX 970 4GB GDDR5 PCIe 3.0 x16 (Maxwell) [+270] (Single Card)
PRICE: $1805