Building a PC for my girlfriend...

PCPartPicker part list / Price breakdown by merchant

Type Item Price
CPU Intel Core i5-6500 3.2GHz Quad-Core Processor $204.99 @ Newegg
CPU Cooler Silverstone AR06 40.2 CFM CPU Cooler $39.99 @ Amazon
Motherboard Asus H170I-PLUS D3 Mini ITX LGA1151 Motherboard $105.99 @ Amazon
Memory G.Skill Ares Series 16GB (2 x 8GB) DDR3-1600 Memory $59.99 @ Newegg
Storage Samsung 850 EVO-Series 500GB 2.5" Solid State Drive $149.99 @ Newegg
Video Card MSI Radeon R9 390 8GB Video Card $319.98 @ SuperBiiz
Case Silverstone RVZ02B HTPC Case $72.50 @ Amazon
Power Supply Silverstone 600W 80+ Gold Certified Fully-Modular SFX Power Supply $117.99 @ Directron
Prices include shipping, taxes, rebates, and discounts
Total (before mail-in rebates) $1066.42
Mail-in rebates -$10.00
Total $1056.42
Generated by PCPartPicker 2015-12-12 12:05 EST-0500

Went over your budget by $50, but I can't imagine you'd have to upgrade this anytime soon. Even if you do, changing the GPU in that case would be easy and you have plenty of room. Plus the case is nice and small.

/r/buildapc Thread