I'm buying a very well made custom gaming computer, but i do not know what specs i should get for it?

I'm hoping it will be able to run over 200 fps stable in minecraft, and will be able to run Steam games very helpfully. Price will not matter, but i do not want overkill. Thank you for your help.

Added (1). I'm having a friend make it from scratch, so he needs to know what he'll be building with, i'm not buying from a website.

Xoticpc.com
cyberpowerpc.com
ibuypower.com

Well to get good FPS, you need 3 main things. LOTS of RAM, LOTS of memory space, and a good graphics card.