Desktop or laptop?
For desktop best to go and DIY or build yourself (it's not hard and youtube shows you how).
Or recruit a forum member to help you out. I'll do it for free if you cover shipping.
You can get any CPU basically these days, for gaming the GPU matters the most. Any R9 Radeon is a good choice, as is a 750ti or higher Nvidia based card. If you go retail then get at least an i3 cpu, and add the GPU card seperate. So like a $350 tower, and drop in a $150 GPU card like a RADEON and you are there.
Personally I would not reccomend, own or operate a PC without an SSD for the OS boot drive. That would be my other advice. Once you upgrade to this and a GPU card, might as well go DIY IMO.