Come to think of it I have not built a system in a while, especially if I don't count my mining rig. My current system is an Intel(R) Core(TM) i3-4150 CPU @ 3.50GHz with 8GB of ram. Gaming machine is an i7 of probably around same generation (it's off now so can't check for sure) with like some oddball amount of ram, 12GB I think. Originally it was 16GB but one ram stick was bad.
I'm kinda due for a new build and kinda have an itch to build two new VM servers so I can setup a proper environment with live migrations and HA etc, but reality is I'm happy with what I got, so not going to spend the money.