So i was on my way on Building a Custom PC for IM Purpose only and Found Someone Selling a System with Following Configuration without Display. Intel Core i5-4460 Processor. Gigabyte GA-B85M-Gaming 3 Motheboard. Corsair vengeance ddr3 8gb x 2 total 16gb RAM. 1tb Seagate HDD. 450 watt Seasonic SMPS. Corsair Spec 01 Cabinet. Cooler Master Gaming Keyboard and Mouse. According to my Calculation if i go out now and buy all these items brand new, it will cost me around $600. This Guy has Used this system for 10 months and is selling it for $360 with invoice. Should i buy it off?