I build my computer myself and managing the systems. You get much better performance and DAW computer and you can specific quality components into your setup. You need still to know “what” quality component to add into the setup.
Also you need still have a lot of “knowhow”, how to do it so its not for everyone especially the novice user or if you have no experience with electro engineering.
I would recommend you have someone that guide you “how to do it safe” the first time. Also read up and check a lot of videos on Internet before you decide to build yourself. 
Its important you don’t touch specific parts with your fingers. Otherwise you can basically destroy the electro components and everything, ending up to being a costly experiment instead.
Use high-quality antistatic gloves all the time especially working around with the CPU, memory, motherboard and cards…
Take your time “months” and gather so much info before you begin order component and building the computer. 
To make a great DAW computer I recommends these high-quality component manufactories.
ASUS motherboard and NVIDIA graphics cards.
INTEL, I7 CPU
http://www.intel.com/content/www/us/en/homepage.html
Memory
CPU Water cooling
http://www.corsair.com/en/cpu-cooling-kits/hydro-series-water-cooling-cpu-cooler.html
POWER PSU 600W -1000W
http://www.seasonicusa.com/index.html
http://www.seasonicusa.com/NEW_X-series_560-660-760-850.htm
Full Tower Case- Cooler Master or Fractal Design
http://www.coolermaster.com/
SSD–only one INTEL…forget the rest
http://www.intel.com/content/www/us/en/homepage.html
Graphic card chip- NVIDIA
Fans 12mm 14mm
Conventional harddrives
Seagate, Western Digital, SAMSUNG
OS- Windows 7 -Ultimate x64 or Windows 8.1 x64
http://www.microsoft.com/en-us/default.aspx
Screens Monitors - 27# or up. SAMSUNG, NEC (BenQ - budget)
Best Regards
Freddie