Here nice gaming pc for 660$ without keyboard and mouse.
CPU-Intel Core i3-4150 3.5GHz Dual-Core Processor
RAM-Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory
GPU-MSI Radeon R9 270X 2GB HAWK Video Card
Motherboard-ASRock H97 Anniversary ATX LGA1150 Motherboard
HDD-Western Digital Caviar Blue 1TB 3.5" 7200RPM
Case-NZXT Source 210 (Black) ATX Mid Tower Case
PSU-EVGA 500W 80+ Bronze Certified ATX Power Supply
Acer G236HLBbd 60Hz 23.0" Monitor