Should I build my own rig or buy this one?

Sep 20, 2015
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I found this sweet rig for $800 online near me, here are its specs.

pics:
http://imgur.com/Ssd89WE
http://imgur.com/TY6I7mw
http://imgur.com/wndaA0n

specs:
Intel i7 4770k quad core cpu
Asus z97i plus mini itx board with wi fi and blutooth
Corsair Vengeance Ram, 8 gigs ddr3 1866
EVGA Supernova G2 750 watt modular, gold rated
Sapphire R9 290x tri x video card, factory oc, 4 gig vram
Corsair h100i liquid cpu cooler, high output fans
Seagate Baracuda 2 tb hard drive
Running Windows 10 64 bit or win 8.1

I've been thinking of building my own PC for a couple months now and have had multiple part lists set up, my latest one being this http://pcpartpicker.com/parts/partlist/

should I build my own PC with that build or just buy the rig above?