I have a PC which I built using...
Intel Xeon E3-1230v2: it gave me i7 specs (i.e hyperthreading) for less cost (and I wasn't interested in overclocking). Not sure how the prices compare these days, and you do have to check motherboard for compatibility.
16GB RAM (nothing particularly swish, spec-wise)
256GB SSD (a must in my opinion)
2GB AMD R9 285
A recent upgrade took my 1TB storage disk to 3TB (mechanical hard drive)
Dell 2412M monitor
I never really notice that I am waiting for it to do anything (although when I was doing some very poor attempts at HDR in PS6, that required a little bit of time, but I think it was still probably less than a minute - but don't quote me on that
)